Resolving decodability for subsequent transmissions whose throughput exceeds a threshold

ABSTRACT

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may determine to decode or refrain from decoding a transport block (TB) transmitted from a base station based on a decodability condition. The decodability condition may include whether an effective UE throughput for decoding the TB is greater than a predetermined decoding throughput threshold or not. If the effective UE throughput is greater than the predetermined decoding throughput threshold, the UE may refrain from decoding the TB. In some cases, the TB may be a subsequent transmission from the base station based on an initial transmission not being correctly decoded, and the UE may refrain from decoding the subsequent transmission.

CROSS REFERENCE

The present Application for Patent claims the benefit of U.S.Provisional Patent Application No. 62/743,524 by KIM, et al., entitled“RESOLVING DECODABILITY FOR RETRANSMISSIONS WHOSE THROUGHPUT EXCEEDS ATHRESHOLD,” filed Oct. 9, 2018, assigned to the assignee hereof, andexpressly incorporated by reference herein.

BACKGROUND

The following relates generally to wireless communications, and morespecifically to resolving decodability for subsequent transmissionswhose throughput exceeds a threshold.

Wireless communications systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be capable ofsupporting communication with multiple users by sharing the availablesystem resources (e.g., time, frequency, and power). Examples of suchmultiple-access systems include fourth generation (4G) systems such asLong-Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, orLTE-A Pro systems, and fifth generation (5G) systems which may bereferred to as New Radio (NR) systems. These systems may employtechnologies such as code division multiple access (CDMA), time divisionmultiple access (TDMA), frequency division multiple access (FDMA),orthogonal frequency division multiple access (OFDMA), or discreteFourier transform-spread-OFDM (DFT-S-OFDM). A wireless multiple-accesscommunications system may include a number of base stations or networkaccess nodes, each simultaneously supporting communication for multiplecommunication devices, which may be otherwise known as user equipment(UE).

In some wireless communications systems, a UE may decode one or moretransport blocks (TBs) from a base station to receive downlinkinformation. Accordingly, the UE may sustain a peak decoding throughputbased on a maximum TB size when decoding the one or more TBs. However, adecoding throughput may exceed the peak decoding throughput in certainsituations. For example, the decoding throughput for a subsequenttransmission of one or more TBs may exceed the peak throughput since thebase station may transmit subsequent TBs at a lower code rate thaninitial TB transmissions. The lower code rate may result in the UEneeding more time to decode the subsequent transmissions based ondecoding a same amount of codeblocks at the lower rate, therebyincreasing the decoding throughput. As such, decoding hardware withinthe UE may become overprovisioned based on attempting to decodesubsequent transmissions where the decoding throughput exceeds the peakdecoding throughput. Efficient techniques are desired for handling theexcessive decoding throughputs.

SUMMARY

The described techniques relate to improved methods, systems, devices,and apparatuses that support resolving decodability for subsequenttransmissions whose throughput exceeds a threshold. Generally, thedescribed techniques provide for a user equipment (UE) receiving atransport block (TB) from a base station and attempting to decode theTB. In some cases, the UE may be unable to decode the TB, and the basestation may retransmit the TB based on a feedback message from the UEindicating the unsuccessful decoding. The UE may then determine whetheror not to process this subsequent transmission (or the TB) based onwhether an effective throughput for the UE exceeds a predetermineddecoding throughput threshold. Subsequently, the UE may decode thesubsequent transmission (or the TB) if the effective throughput for theUE is less than the predetermined decoding throughput threshold orrefrain from decoding the subsequent transmission if the effectivethroughput for the UE exceeds the predetermined decoding throughputthreshold.

The predetermined decoding throughput threshold may be based on athroughput for decoding a TB of a maximum TB size transmitted in afourteen-symbol duration, a number of codeblocks for transmitting a TBof a maximum TB size, a length of a codeblock-level cyclic redundancycheck (CRC), a length of a TB-level CRC, a coding rate for transmittinga TB of maximum TB size with limited-buffer rate-matching (LBRM)enabled, a scaling factor, or any combination thereof. Additionally, theeffective throughput of the subsequent transmission for the UE may bebased on a sub-carrier spacing (SCS) for the subsequent transmission, aminimum SCS configured for a component carrier, a number of transmittedcodeblocks in the TB, a circular buffer size, a physical downlink sharedchannel (PDSCH) duration for the subsequent transmission, a set of TBsscheduled in a fourteen-consecutive-symbol duration, or any combinationthereof.

A method of wireless communication at a UE is described. The method mayinclude receiving, from a base station, a transmission including a TB,attempting to decode the transmission, transmitting a feedback messageto the base station indicating that at least a portion of thetransmission including the TB was unsuccessfully decoded, receiving,from the base station, one or more subsequent transmissions of at leastthe TB, determining an effective UE throughput of the one or moresubsequent transmissions of at least the TB based on scaling an initialUE throughput based on a function which is dependent at least upon aduration of a physical downlink shared channel for the TB and a numberof orthogonal frequency division multiplexing (OFDM) symbols of the oneor more subsequent transmissions of at least the TB, and processing asubsequent transmission of the one or more subsequent transmissionsbased on whether the effective UE throughput of the one or moresubsequent transmissions exceeds a predetermined decoding throughputthreshold.

An apparatus for wireless communication at a UE is described. Theapparatus may include a processor, memory coupled with the processor,and instructions stored in the memory. The instructions may beexecutable by the processor to cause the apparatus to receive, from abase station, a transmission including a TB, attempt to decode thetransmission, transmit a feedback message to the base station indicatingthat at least a portion of the transmission including the TB wasunsuccessfully decoded, receive, from the base station, one or moresubsequent transmissions of at least the TB, determine an effective UEthroughput of the one or more subsequent transmissions of at least theTB based on scaling an initial UE throughput based on a function whichis dependent at least upon a duration of a physical downlink sharedchannel for the TB and a number of OFDM symbols of the one or moresubsequent transmissions of at least the TB, and process a subsequenttransmission of the one or more subsequent transmissions based onwhether the effective UE throughput of the one or more subsequenttransmissions exceeds a predetermined decoding throughput threshold.

Another apparatus for wireless communication at a UE is described. Theapparatus may include means for receiving, from a base station, atransmission including a TB, attempting to decode the transmission,transmitting a feedback message to the base station indicating that atleast a portion of the transmission including the TB was unsuccessfullydecoded, receiving, from the base station, one or more subsequenttransmissions of at least the TB, determining an effective UE throughputof the one or more subsequent transmissions of at least the TB based onscaling an initial UE throughput based on a function which is dependentat least upon a duration of a physical downlink shared channel for theTB and a number of OFDM symbols of the one or more subsequenttransmissions of at least the TB, and processing a subsequenttransmission of the one or more subsequent transmissions based onwhether the effective UE throughput of the one or more subsequenttransmissions exceeds a predetermined decoding throughput threshold.

A non-transitory computer-readable medium storing code for wirelesscommunication at a UE is described. The code may include instructionsexecutable by a processor to receive, from a base station, atransmission including a TB, attempt to decode the transmission,transmit a feedback message to the base station indicating that at leasta portion of the transmission including the TB was unsuccessfullydecoded, receive, from the base station, one or more subsequenttransmissions of at least the TB, determine an effective UE throughputof the one or more subsequent transmissions of at least the TB based onscaling an initial UE throughput based on a function which is dependentat least upon a duration of a physical downlink shared channel for theTB and a number of OFDM symbols of the one or more subsequenttransmissions of at least the TB, and process a subsequent transmissionof the one or more subsequent transmissions based on whether theeffective UE throughput of the one or more subsequent transmissionsexceeds a predetermined decoding throughput threshold.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, processing the subsequenttransmission of the one or more subsequent transmissions may furtherinclude operations, features, means, or instructions for decoding thesubsequent transmission based on the effective UE throughput of the oneor more subsequent transmissions being less than the predetermineddecoding throughput threshold.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, processing the subsequenttransmission of the one or more subsequent transmissions may furtherinclude operations, features, means, or instructions for refraining fromdecoding the subsequent transmission based on the effective UEthroughput of the one or more subsequent transmissions exceeding thepredetermined decoding throughput threshold.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, processing the subsequenttransmission of the one or more subsequent transmissions may furtherinclude operations, features, means, or instructions for refraining fromdecoding any of the one or more subsequent transmissions based on theeffective UE throughput of the one or more subsequent transmissionsexceeding the predetermined decoding throughput threshold.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, processing the subsequenttransmission of the one or more subsequent transmissions may furtherinclude operations, features, means, or instructions for refraining fromdecoding the TB of the one or more subsequent transmissions based on theeffective UE throughput of the one or more subsequent transmissionsexceeding the predetermined decoding throughput threshold.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the predetermined decodingthroughput threshold (TP_(max)) may be defined as

${{TP}_{\max} = {\frac{1}{R_{LBRM}}{TBS}_{LBRM}}},$

where TBS_(LBRM) is a maximum TB size with limited buffer rate matching(LBRM) enabled, and where R_(LBRM) is a coding rate when transmitting aTB of the maximum TB size with LBRM enabled.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the effective UE throughputof the subsequent transmission may be defined as

${2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum_{i \in S}{{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot x_{i}}F_{i}}}},$

where μ relates to a sub-carrier spacing (SCS) for the one or moresubsequent transmissions for an active bandwidth part, μ′ corresponds toan SCS of a bandwidth part across all configured bandwidth parts of acarrier that has a largest configured number of physical resourceblocks, C′_(i) is a number of scheduled codeblocks for an i^(th) TB,L_(i) is a PDSCH duration for the i^(th) TB, S is a set of TBs scheduledpartially or fully in a consecutive-symbol duration for the i^(th) TB,x_(i) is a number of OFDM symbols of the one or more subsequenttransmissions of the i^(th) TB, F_(i) is a number of coded bits in acodeblock and is a maximum value of a min(k^(0,i) _(j)+E_(i) ^(j),N_(cb,i)), where k_(0,i) ^(j) is a starting location of a redundancyvalue for a j^(th) transmission, E_(i) ^(l) is a min(E_(r)) of scheduledcode blocks for the j^(th) transmission, N_(cb,i) is a circular bufferlength, where j ranges from 0 to J−1, where J−1 is a current subsequenttransmission for the

${i^{th}{TB}},\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor$

is a floor function for the input of

$\frac{C_{i}^{\prime}}{L_{i}}\mspace{14mu} {and}\mspace{14mu} {2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum_{i \in S}{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot F_{i}}}}$

represents the initial UE throughput.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the effective UE throughputof the subsequent transmission may be evaluated for an interval endingat an end of a last symbol of a latest PDSCH transmission.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the subsequent transmissionof the one or more subsequent transmissions may be a last-receivedsubsequent transmission.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the predetermined decodingthroughput threshold may be based on a throughput for decoding a TB of amaximum TB size transmitted in a fourteen-symbol duration.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the predetermined decodingthroughput threshold may be based on a maximum TB size, a number ofcodeblocks for transmitting a TB of the maximum TB size, a length of acodeblock-level CRC, a length of a transport-level CRC, a coding ratefor transmitting a TB of the maximum TB size with LBRM enabled, and ascaling factor.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the scaling factor may beone.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the scaling factor may begreater than one.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the effective UE throughputof the one or more subsequent transmissions may be based on a number oftransmitted codeblocks in the TB, a circular buffer size, and a PDSCHduration for the one or more subsequent transmissions.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the effective UE throughputof the subsequent transmission may be applicable for a subsequenttransmission whose PDSCH duration is greater than a mini-slot durationbut may be not applicable for subsequent transmissions involvingdifferent sub-carrier spacing values or back-to-back subsequenttransmissions whose PDSCH durations is of a mini-slot.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the effective UE throughputof the one or more subsequent transmissions may be further based on anSCS of the subsequent transmission and a minimum SCS of a componentcarrier carrying the one or more subsequent transmissions.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the effective UE throughputof the subsequent transmission may be applicable for a subsequenttransmission whose PDSCH duration is greater than a mini-slot durationand may be applicable for a subsequent transmission involving differentSCS values than the transmission including the TB.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the effective UE throughputof the one or more subsequent transmissions may be further based on asum of UE throughputs for multiple TBs in the one or more subsequenttransmissions.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the effective UE throughputof the one or more subsequent transmissions may be applicable forsubsequent transmissions that are not using a redundancy version zero,where the redundancy version zero indicates the subsequent transmissionsbegin at a bit zero of an encoded information message.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the effective UE throughputof the one or more subsequent transmissions may be applicable regardlessof a redundancy version used by the one or more subsequenttransmissions, where the redundancy version indicates a location in anencoded information message where the one or more subsequenttransmissions begin.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, processing the subsequenttransmission of the one or more subsequent transmissions may includeoperations, features, means, or instructions for determining whether theUE is required to decode the subsequent transmission of the one or moresubsequent transmissions.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for determining whether theUE is required to decode the subsequent transmission of the one or moresubsequent transmissions is based on whether an effective UE throughputof at least the one or more subsequent transmissions exceeds thepredetermined decoding throughput threshold.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a system for wireless communicationsthat supports resolving decodability for subsequent transmissions whosethroughput exceeds a threshold in accordance with aspects of the presentdisclosure.

FIG. 2 illustrates an example of a wireless communications system thatsupports resolving decodability for subsequent transmissions whosethroughput exceeds a threshold in accordance with aspects of the presentdisclosure.

FIG. 3 illustrates an example of a process flow that supports resolvingdecodability for subsequent transmissions in accordance with aspects ofthe present disclosure.

FIGS. 4 and 5 show block diagrams of devices that support resolvingdecodability for subsequent transmissions in accordance with aspects ofthe present disclosure.

FIG. 6 shows a block diagram of a communications manager that supportsresolving decodability for subsequent transmissions in accordance withaspects of the present disclosure.

FIG. 7 shows a diagram of a system including a device that supportsresolving decodability for subsequent transmissions in accordance withaspects of the present disclosure.

FIGS. 8 through 10 show flowcharts illustrating methods that supportresolving decodability for subsequent transmissions in accordance withaspects of the present disclosure.

DETAILED DESCRIPTION

Some wireless communications systems may support the use of errorcorrecting codes for introducing redundancy in a codeword so thattransmission errors may be detected and corrected. These errorcorrecting codes may generally compensate for the intrinsicunreliability of information transfer over the air interface.Low-density parity-check (LDPC) codes are one type of error correctingcodes which may be used to increase the robustness of a transmission. Inaddition to using error correcting codes, a wireless device may alsosupport subsequent transmissions of a codeword to increase thelikelihood that the codeword is received successfully. Each of themultiple transmissions (e.g., and subsequent transmissions) may includesome portion of systematic bits (e.g., generated by a kernel of anencoder) and parity bits of the codeword, such that the decoder can useincremental redundancy (IR) to combine the codeword bits received in themultiple transmissions.

A user equipment (UE) may be designed to sustain a peak decodingthroughput based on a maximum transport block (TB) size (TBS) whendecoding a received codeword in a corresponding TB. The maximum TBS maybe based on a largest TBS transmitted in a physical downlink sharedchannel (PDSCH) within a slot (e.g., fourteen symbols). In some cases,however, a decoding throughput may exceed the peak decoding throughput.For example, a transmission or subsequent transmission of a TB at ornear a peak data rate (e.g., associated with the peak decodingthroughput) in a higher subcarrier spacing (SCS) with multiplenumerologies (e.g., SCSs) configured across different bandwidth parts(BWPs) of a downlink may result in a decoding throughput higher than thepeak decoding throughput. Additionally or alternatively, a TBtransmitted with a PDSCH duration significantly shorter than a slotduration (e.g., a mini-slot) or a TB subsequent transmission occurringon a significantly shorter PDSCH duration than the initial TBtransmission may result in a higher decoding throughput than the peakdecoding throughput. Accordingly, if the UE attempts to decode acodeword that corresponds to a higher decoding throughput than the peakdecoding throughput, decoding hardware within the UE may need to beoverprovisioned.

To handle the high decoding throughputs, the UE may process one or moresubsequent TB transmissions utilizing a decodability criterion ormetric. According to the decodability criterion or metric, the UE mayrefrain from decoding one or more TB subsequent transmissions (or theTB) when one or more TB subsequent transmissions would require adecoding throughput exceeding a predetermined decoding throughputthreshold. The predetermined decoding throughput threshold may be basedon a maximum TBS, a throughput required to decode a TB of the maximumTBS transmitted in a fourteen-symbol duration, a number of codeblocksfor transmitting a TB of the maximum TB size, a length of acodeblock-level cyclic redundancy check (CRC), a length of a TB-levelCRC, a coding rate for transmitting a TB of maximum TB size withlimited-buffer rate-matching (LBRM) enabled, a scaling factor, or acombination thereof. Additionally, the decoding throughput may be basedon an SCS for the one or more subsequent transmissions, a minimum SCSconfigured for a component carrier (CC), a number of transmittedcodeblocks in the TB, a circular buffer size, a PDSCH duration for theone or more subsequent transmissions, a set of TBs scheduled in afourteen-consecutive-symbol duration, a PDSCH duration for an i^(th) TB,a number of orthogonal frequency division multiplexing (OFDM) symbols ofone or more retransmissions of an i^(th) TB, or any combination thereof.Accordingly, the UE may decode one or more of the subsequenttransmissions if the decoding throughput is less than the predetermineddecoding throughput threshold or may refrain from decoding thesubsequent transmission if the decoding throughput exceeds thepredetermined decoding throughput threshold. In some cases, the UE mayuse a PDSCH skipping rule as part of reducing the decoding throughput onone or more subsequent transmissions, TBs, or a combination thereof.

Aspects of the disclosure are initially described in the context of awireless communications system. An additional wireless communicationssystem and a process flow are then provided to describe aspects of thedisclosure. Aspects of the disclosure are further illustrated by anddescribed with reference to apparatus diagrams, system diagrams, andflowcharts that relate to resolving decodability for subsequenttransmissions.

FIG. 1 illustrates an example of a wireless communications system 100that supports resolving decodability for subsequent transmissions whosethroughput exceeds a threshold in accordance with aspects of the presentdisclosure. The wireless communications system 100 includes basestations 105, UEs 115, and a core network 130. In some examples, thewireless communications system 100 may be a Long-Term Evolution (LTE)network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a NewRadio (NR) network. In some cases, the wireless communications system100 may support enhanced broadband communications, ultra-reliable (e.g.,mission critical) communications, low latency communications, orcommunications with low-cost and low-complexity devices.

Base stations 105 may wirelessly communicate with UEs 115 via one ormore base station antennas. Base stations 105 described herein mayinclude or may be referred to by those skilled in the art as a basetransceiver station, a radio base station, an access point, a radiotransceiver, a NodeB, an eNodeB (eNB), a next-generation Node B orgiga-nodeB (either of which may be referred to as a gNB), a Home NodeB,a Home eNodeB, or some other suitable terminology. Wirelesscommunications system 100 may include base stations 105 of differenttypes (e.g., macro or small cell base stations). The UEs 115 describedherein may be able to communicate with various types of base stations105 and network equipment including macro eNBs, small cell eNBs, gNBs,base stations acting as relays (e.g., intermediary base stationsforwarding transmissions to and from other base stations), and the like.

Each base station 105 may be associated with a particular geographiccoverage area 110 in which communications with various UEs 115 issupported. Each base station 105 may provide communication coverage fora respective geographic coverage area 110 via communication links 125,and communication links 125 between a base station 105 and a UE 115 mayutilize one or more carriers. Communication links 125 shown in wirelesscommunications system 100 may include uplink transmissions from a UE 115to a base station 105, or downlink transmissions from a base station 105to a UE 115. Downlink transmissions may also be called forward linktransmissions while uplink transmissions may also be called reverse linktransmissions.

The geographic coverage area 110 for a base station 105 may be dividedinto sectors making up only a portion of the geographic coverage area110, and each sector may be associated with a cell. For example, eachbase station 105 may provide communication coverage for a macro cell, asmall cell, a hot spot, or other types of cells, or various combinationsthereof. In some examples, a base station 105 may be movable andtherefore provide communication coverage for a moving geographiccoverage area 110. In some examples, different geographic coverage areas110 associated with different technologies may overlap, and overlappinggeographic coverage areas 110 associated with different technologies maybe supported by the same base station 105 or by different base stations105. The wireless communications system 100 may include, for example, aheterogeneous LTE/LTE-A/LTE-A Pro or NR network in which different typesof base stations 105 provide coverage for various geographic coverageareas 110.

The term “cell” refers to a logical communication entity used forcommunication with a base station 105 (e.g., over a carrier), and may beassociated with an identifier for distinguishing neighboring cells(e.g., a physical cell identifier (PCID), a virtual cell identifier(VCID)) operating via the same or a different carrier. In some examples,a carrier may support multiple cells, and different cells may beconfigured according to different protocol types (e.g., machine-typecommunication (MTC), narrowband Internet-of-Things (NB-IoT), enhancedmobile broadband (eMBB), or others) that may provide access fordifferent types of devices. In some cases, the term “cell” may refer toa portion of a geographic coverage area 110 (e.g., a sector) over whichthe logical entity operates.

UEs 115 may be dispersed throughout the wireless communications system100, and each UE 115 may be stationary or mobile. A UE 115 may also bereferred to as a mobile device, a wireless device, a remote device, ahandheld device, or a subscriber device, or some other suitableterminology, where the “device” may also be referred to as a unit, astation, a terminal, or a client. A UE 115 may be a personal electronicdevice such as a cellular phone, a personal digital assistant (PDA), atablet computer, a laptop computer, or a personal computer. In someexamples, a UE 115 may also refer to a wireless local loop (WLL)station, an Internet of Things (IoT) device, an Internet of Everything(IoE) device, or an MTC device, or the like, which may be implemented invarious articles such as appliances, vehicles, meters, or the like.

Some UEs 115, such as MTC or IoT devices, may be low cost or lowcomplexity devices, and may provide for automated communication betweenmachines (e.g., via Machine-to-Machine (M2M) communication). M2Mcommunication or MTC may refer to data communication technologies thatallow devices to communicate with one another or a base station 105without human intervention. In some examples, M2M communication or MTCmay include communications from devices that integrate sensors or metersto measure or capture information and relay that information to acentral server or application program that can make use of theinformation or present the information to humans interacting with theprogram or application. Some UEs 115 may be designed to collectinformation or enable automated behavior of machines. Examples ofapplications for MTC devices include smart metering, inventorymonitoring, water level monitoring, equipment monitoring, healthcaremonitoring, wildlife monitoring, weather and geological eventmonitoring, fleet management and tracking, remote security sensing,physical access control, and transaction-based business charging.

Some UEs 115 may be configured to employ operating modes that reducepower consumption, such as half-duplex communications (e.g., a mode thatsupports one-way communication via transmission or reception, but nottransmission and reception simultaneously). In some examples half-duplexcommunications may be performed at a reduced peak rate. Other powerconservation techniques for UEs 115 include entering a power saving“deep sleep” mode when not engaging in active communications, oroperating over a limited bandwidth (e.g., according to narrowbandcommunications). In some cases, UEs 115 may be designed to supportcritical functions (e.g., mission critical functions), and a wirelesscommunications system 100 may be configured to provide ultra-reliablecommunications for these functions.

In some cases, a UE 115 may also be able to communicate directly withother UEs 115 (e.g., using a peer-to-peer (P2P) or device-to-device(D2D) protocol). One or more of a group of UEs 115 utilizing D2Dcommunications may be within the geographic coverage area 110 of a basestation 105. Other UEs 115 in such a group may be outside the geographiccoverage area 110 of a base station 105 or be otherwise unable toreceive transmissions from a base station 105. In some cases, groups ofUEs 115 communicating via D2D communications may utilize a one-to-many(1:M) system in which each UE 115 transmits to every other UE 115 in thegroup. In some cases, a base station 105 facilitates the scheduling ofresources for D2D communications. In other cases, D2D communications arecarried out between UEs 115 without the involvement of a base station105.

Base stations 105 may communicate with the core network 130 and with oneanother. For example, base stations 105 may interface with the corenetwork 130 through backhaul links 132 (e.g., via an S1, N2, N3, orother interface). Base stations 105 may communicate with one anotherover backhaul links 134 (e.g., via an X2, Xn, or other interface) eitherdirectly (e.g., directly between base stations 105) or indirectly (e.g.,via core network 130).

The core network 130 may provide user authentication, accessauthorization, tracking, Internet Protocol (IP) connectivity, and otheraccess, routing, or mobility functions. The core network 130 may be anevolved packet core (EPC), which may include at least one mobilitymanagement entity (MME), at least one serving gateway (S-GW), and atleast one Packet Data Network (PDN) gateway (P-GW). The MME may managenon-access stratum (e.g., control plane) functions such as mobility,authentication, and bearer management for UEs 115 served by basestations 105 associated with the EPC. User IP packets may be transferredthrough the S-GW, which itself may be connected to the P-GW. The P-GWmay provide IP address allocation as well as other functions. The P-GWmay be connected to the network operators IP services. The operators IPservices may include access to the Internet, Intranet(s), an IPMultimedia Subsystem (IMS), or a Packet-Switched (PS) Streaming Service.

At least some of the network devices, such as a base station 105, mayinclude subcomponents such as an access network entity, which may be anexample of an access node controller (ANC). Each access network entitymay communicate with UEs 115 through a number of other access networktransmission entities, which may be referred to as a radio head, a smartradio head, or a transmission/reception point (TRP). In someconfigurations, various functions of each access network entity or basestation 105 may be distributed across various network devices (e.g.,radio heads and access network controllers) or consolidated into asingle network device (e.g., a base station 105).

Wireless communications system 100 may operate using one or morefrequency bands, typically in the range of 300 MHz to 300 GHz.Generally, the region from 300 MHz to 3 GHz is known as the ultra-highfrequency (UHF) region or decimeter band, since the wavelengths rangefrom approximately one decimeter to one meter in length. UHF waves maybe blocked or redirected by buildings and environmental features.However, the waves may penetrate structures sufficiently for a macrocell to provide service to UEs 115 located indoors. Transmission of UHFwaves may be associated with smaller antennas and shorter range (e.g.,less than 100 km) compared to transmission using the smaller frequenciesand longer waves of the high frequency (HF) or very high frequency (VHF)portion of the spectrum below 300 MHz.

Wireless communications system 100 may also operate in a super highfrequency (SHF) region using frequency bands from 3 GHz to 30 GHz, alsoknown as the centimeter band. The SHF region includes bands such as the5 GHz industrial, scientific, and medical (ISM) bands, which may be usedopportunistically by devices that can tolerate interference from otherusers.

Wireless communications system 100 may also operate in an extremely highfrequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz),also known as the millimeter band. In some examples, wirelesscommunications system 100 may support millimeter wave (mmW)communications between UEs 115 and base stations 105, and EHF antennasof the respective devices may be even smaller and more closely spacedthan UHF antennas. In some cases, this may facilitate use of antennaarrays within a UE 115. However, the propagation of EHF transmissionsmay be subject to even greater atmospheric attenuation and shorter rangethan SHF or UHF transmissions. Techniques disclosed herein may beemployed across transmissions that use one or more different frequencyregions, and designated use of bands across these frequency regions maydiffer by country or regulating body.

In some cases, wireless communications system 100 may utilize bothlicensed and unlicensed radio frequency spectrum bands. For example,wireless communications system 100 may employ License Assisted Access(LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technologyin an unlicensed band such as the 5 GHz ISM band. When operating inunlicensed radio frequency spectrum bands, wireless devices such as basestations 105 and UEs 115 may employ listen-before-talk (LBT) proceduresto ensure a frequency channel is clear before transmitting data. In somecases, operations in unlicensed bands may be based on a CA configurationin conjunction with CCs operating in a licensed band (e.g., LAA).Operations in unlicensed spectrum may include downlink transmissions,uplink transmissions, peer-to-peer transmissions, or a combination ofthese. Duplexing in unlicensed spectrum may be based on frequencydivision duplexing (FDD), time division duplexing (TDD), or acombination of both.

In some examples, base station 105 or UE 115 may be equipped withmultiple antennas, which may be used to employ techniques such astransmit diversity, receive diversity, multiple-input multiple-output(MIMO) communications, or beamforming. For example, wirelesscommunications system 100 may use a transmission scheme between atransmitting device (e.g., a base station 105) and a receiving device(e.g., a UE 115), where the transmitting device is equipped withmultiple antennas and the receiving devices are equipped with one ormore antennas. MIMO communications may employ multipath signalpropagation to increase the spectral efficiency by transmitting orreceiving multiple signals via different spatial layers, which may bereferred to as spatial multiplexing. The multiple signals may, forexample, be transmitted by the transmitting device via differentantennas or different combinations of antennas. Likewise, the multiplesignals may be received by the receiving device via different antennasor different combinations of antennas. Each of the multiple signals maybe referred to as a separate spatial stream and may carry bitsassociated with the same data stream (e.g., the same codeword) ordifferent data streams. Different spatial layers may be associated withdifferent antenna ports used for channel measurement and reporting. MIMOtechniques include single-user MIMO (SU-MIMO) where multiple spatiallayers are transmitted to the same receiving device, and multiple-userMIMO (MU-MIMO) where multiple spatial layers are transmitted to multipledevices.

Beamforming, which may also be referred to as spatial filtering,directional transmission, or directional reception, is a signalprocessing technique that may be used at a transmitting device or areceiving device (e.g., a base station 105 or a UE 115) to shape orsteer an antenna beam (e.g., a transmit beam or receive beam) along aspatial path between the transmitting device and the receiving device.Beamforming may be achieved by combining the signals communicated viaantenna elements of an antenna array such that signals propagating atparticular orientations with respect to an antenna array experienceconstructive interference while others experience destructiveinterference. The adjustment of signals communicated via the antennaelements may include a transmitting device or a receiving deviceapplying certain amplitude and phase offsets to signals carried via eachof the antenna elements associated with the device. The adjustmentsassociated with each of the antenna elements may be defined by abeamforming weight set associated with a particular orientation (e.g.,with respect to the antenna array of the transmitting device orreceiving device, or with respect to some other orientation).

In one example, a base station 105 may use multiple antennas or antennaarrays to conduct beamforming operations for directional communicationswith a UE 115. For instance, some signals (e.g. synchronization signals,reference signals, beam selection signals, or other control signals) maybe transmitted by a base station 105 multiple times in differentdirections, which may include a signal being transmitted according todifferent beamforming weight sets associated with different directionsof transmission. Transmissions in different beam directions may be usedto identify (e.g., by the base station 105 or a receiving device, suchas a UE 115) a beam direction for subsequent transmission and/orreception by the base station 105. Some signals, such as data signalsassociated with a particular receiving device, may be transmitted by abase station 105 in a single beam direction (e.g., a directionassociated with the receiving device, such as a UE 115). In someexamples, the beam direction associated with transmissions along asingle beam direction may be determined based at least in in part on asignal that was transmitted in different beam directions. For example, aUE 115 may receive one or more of the signals transmitted by the basestation 105 in different directions, and the UE 115 may report to thebase station 105 an indication of the signal it received with a highestsignal quality, or an otherwise acceptable signal quality. Althoughthese techniques are described with reference to signals transmitted inone or more directions by a base station 105, a UE 115 may employsimilar techniques for transmitting signals multiple times in differentdirections (e.g., for identifying a beam direction for subsequenttransmission or reception by the UE 115), or transmitting a signal in asingle direction (e.g., for transmitting data to a receiving device).

A receiving device (e.g., a UE 115, which may be an example of a mmWreceiving device) may try multiple receive beams when receiving varioussignals from the base station 105, such as synchronization signals,reference signals, beam selection signals, or other control signals. Forexample, a receiving device may try multiple receive directions byreceiving via different antenna subarrays, by processing receivedsignals according to different antenna subarrays, by receiving accordingto different receive beamforming weight sets applied to signals receivedat a plurality of antenna elements of an antenna array, or by processingreceived signals according to different receive beamforming weight setsapplied to signals received at a plurality of antenna elements of anantenna array, any of which may be referred to as “listening” accordingto different receive beams or receive directions. In some examples areceiving device may use a single receive beam to receive along a singlebeam direction (e.g., when receiving a data signal). The single receivebeam may be aligned in a beam direction determined based at least inpart on listening according to different receive beam directions (e.g.,a beam direction determined to have a highest signal strength, highestsignal-to-noise ratio, or otherwise acceptable signal quality based atleast in part on listening according to multiple beam directions).

In some cases, the antennas of a base station 105 or UE 115 may belocated within one or more antenna arrays, which may support MIMOoperations, or transmit or receive beamforming. For example, one or morebase station antennas or antenna arrays may be co-located at an antennaassembly, such as an antenna tower. In some cases, antennas or antennaarrays associated with a base station 105 may be located in diversegeographic locations. A base station 105 may have an antenna array witha number of rows and columns of antenna ports that the base station 105may use to support beamforming of communications with a UE 115.Likewise, a UE 115 may have one or more antenna arrays that may supportvarious MIMO or beamforming operations.

In some cases, wireless communications system 100 may be a packet-basednetwork that operate according to a layered protocol stack. In the userplane, communications at the bearer or Packet Data Convergence Protocol(PDCP) layer may be IP-based. A Radio Link Control (RLC) layer may insome cases perform packet segmentation and reassembly to communicateover logical channels. A Medium Access Control (MAC) layer may performpriority handling and multiplexing of logical channels into transportchannels. The MAC layer may also use hybrid automatic repeat request(HARQ) to provide retransmission at the MAC layer to improve linkefficiency. In the control plane, the Radio Resource Control (RRC)protocol layer may provide establishment, configuration, and maintenanceof an RRC connection between a UE 115 and a base station 105 or corenetwork 130 supporting radio bearers for user plane data. At thePhysical (PHY) layer, transport channels may be mapped to physicalchannels.

In some cases, UEs 115 and base stations 105 may support subsequenttransmissions (e.g., retransmissions) of data to increase the likelihoodthat data is received successfully. HARQ feedback is one technique ofincreasing the likelihood that data is received correctly over acommunication link 125. HARQ may include a combination of errordetection (e.g., using a cyclic redundancy check (CRC)), forward errorcorrection (FEC), and subsequent transmission or retransmission (e.g.,automatic repeat request (ARQ)). HARQ may improve throughput at the MAClayer in poor radio conditions (e.g., signal-to-noise conditions). Insome cases, a wireless device may support same-slot HARQ feedback, wherethe device may provide HARQ feedback in a specific slot for datareceived in a previous symbol in the slot. In other cases, the devicemay provide HARQ feedback in a subsequent slot, or according to someother time interval.

Time intervals in LTE or NR may be expressed in multiples of a basictime unit, which may, for example, refer to a sampling period ofT_(s)=1/30,720,000 seconds. Time intervals of a communications resourcemay be organized according to radio frames each having a duration of 10milliseconds (ms), where the frame period may be expressed asT_(f)=307,200 T_(s). The radio frames may be identified by a systemframe number (SFN) ranging from 0 to 1023. Each frame may include 10subframes numbered from 0 to 9, and each subframe may have a duration of1 ms. A subframe may be further divided into 2 slots each having aduration of 0.5 ms, and each slot may contain 6 or 7 modulation symbolperiods (e.g., depending on the length of the cyclic prefix prepended toeach symbol period). Excluding the cyclic prefix, each symbol period maycontain 2048 sampling periods. In some cases, a subframe may be thesmallest scheduling unit of the wireless communications system 100 andmay be referred to as a transmission time interval (TTI). In othercases, a smallest scheduling unit of the wireless communications system100 may be shorter than a subframe or may be dynamically selected (e.g.,in bursts of shortened TTIs (sTTIs) or in selected component carriersusing sTTIs).

In some wireless communications systems, a slot may further be dividedinto multiple mini-slots containing one or more symbols. In someinstances, a symbol of a mini-slot or a mini-slot may be the smallestunit of scheduling. Each symbol may vary in duration depending on thesubcarrier spacing or frequency band of operation, for example. Further,some wireless communications systems may implement slot aggregation inwhich multiple slots or mini-slots are aggregated together and used forcommunication between a UE 115 and a base station 105.

The term “carrier” refers to a set of radio frequency spectrum resourceshaving a defined physical layer structure for supporting communicationsover a communication link 125. For example, a carrier of a communicationlink 125 may include a portion of a radio frequency spectrum band thatis operated according to physical layer channels for a given radioaccess technology. Each physical layer channel may carry user data,control information, or other signaling. A carrier may be associatedwith a pre-defined frequency channel (e.g., an E-UTRA absolute radiofrequency channel number (EARFCN)), and may be positioned according to achannel raster for discovery by UEs 115. Carriers may be downlink oruplink (e.g., in an FDD mode), or be configured to carry downlink anduplink communications (e.g., in a TDD mode). In some examples, signalwaveforms transmitted over a carrier may be made up of multiplesub-carriers (e.g., using multi-carrier modulation (MCM) techniques suchas orthogonal frequency division multiplexing (OFDM) or discrete Fouriertransform-spread-OFDM (DFT-s-OFDM)).

The organizational structure of the carriers may be different fordifferent radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR,etc.). For example, communications over a carrier may be organizedaccording to TTIs or slots, each of which may include user data as wellas control information or signaling to support decoding the user data. Acarrier may also include dedicated acquisition signaling (e.g.,synchronization signals or system information, etc.) and controlsignaling that coordinates operation for the carrier. In some examples(e.g., in a carrier aggregation configuration), a carrier may also haveacquisition signaling or control signaling that coordinates operationsfor other carriers.

Physical channels may be multiplexed on a carrier according to varioustechniques. A physical control channel and a physical data channel maybe multiplexed on a downlink carrier, for example, using time divisionmultiplexing (TDM) techniques, frequency division multiplexing (FDM)techniques, or hybrid TDM-FDM techniques. In some examples, controlinformation transmitted in a physical control channel may be distributedbetween different control regions in a cascaded manner (e.g., between acommon control region or common search space and one or more UE-specificcontrol regions or UE-specific search spaces).

A carrier may be associated with a particular bandwidth of the radiofrequency spectrum, and in some examples the carrier bandwidth may bereferred to as a “system bandwidth” of the carrier or the wirelesscommunications system 100. For example, the carrier bandwidth may be oneof a number of predetermined bandwidths for carriers of a particularradio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). Insome examples, each served UE 115 may be configured for operating overportions or all of the carrier bandwidth. In other examples, some UEs115 may be configured for operation using a narrowband protocol typethat is associated with a predefined portion or range (e.g., set ofsubcarriers or resource blocks (RBs)) within a carrier (e.g., “in-band”deployment of a narrowband protocol type).

In a system employing MCM techniques, a resource element may consist ofone symbol period (e.g., a duration of one modulation symbol) and onesubcarrier, where the symbol period and subcarrier spacing are inverselyrelated. The number of bits carried by each resource element may dependon the modulation scheme (e.g., the order of the modulation scheme).Thus, the more resource elements that a UE 115 receives and the higherthe order of the modulation scheme, the higher the data rate may be forthe UE 115. In MIMO systems, a wireless communications resource mayrefer to a combination of a radio frequency spectrum resource, a timeresource, and a spatial resource (e.g., spatial layers), and the use ofmultiple spatial layers may further increase the data rate forcommunications with a UE 115.

Devices of the wireless communications system 100 (e.g., base stations105 or UEs 115) may have a hardware configuration that supportscommunications over a particular carrier bandwidth or may beconfigurable to support communications over one of a set of carrierbandwidths. In some examples, the wireless communications system 100 mayinclude base stations 105 and/or UEs 115 that can support simultaneouscommunications via carriers associated with more than one differentcarrier bandwidth.

Wireless communications system 100 may support communication with a UE115 on multiple cells or carriers, a feature which may be referred to ascarrier aggregation (CA) or multi-carrier operation. A UE 115 may beconfigured with multiple downlink CCs and one or more uplink CCsaccording to a carrier aggregation configuration. Carrier aggregationmay be used with both FDD and TDD component carriers.

In some cases, wireless communications system 100 may utilize enhancedcomponent carriers (eCCs). An eCC may be characterized by one or morefeatures including wider carrier or frequency channel bandwidth, shortersymbol duration, shorter TTI duration, or modified control channelconfiguration. In some cases, an eCC may be associated with a carrieraggregation configuration or a dual connectivity configuration (e.g.,when multiple serving cells have a suboptimal or non-ideal backhaullink). An eCC may also be configured for use in unlicensed spectrum orshared spectrum (e.g., where more than one operator is allowed to usethe spectrum). An eCC characterized by wide carrier bandwidth mayinclude one or more segments that may be utilized by UEs 115 that arenot capable of monitoring the whole carrier bandwidth or are otherwiseconfigured to use a limited carrier bandwidth (e.g., to conserve power).

In some cases, an eCC may utilize a different symbol duration than otherCCs, which may include use of a reduced symbol duration as compared withsymbol durations of the other CCs. A shorter symbol duration may beassociated with increased spacing between adjacent subcarriers. Adevice, such as a UE 115 or base station 105, utilizing eCCs maytransmit wideband signals (e.g., according to frequency channel orcarrier bandwidths of 20, 40, 60, 80 MHz, etc.) at reduced symboldurations (e.g., 16.67 microseconds). A TTI in eCC may consist of one ormultiple symbol periods. In some cases, the TTI duration (that is, thenumber of symbol periods in a TTI) may be variable.

Wireless communications systems such as an NR system may utilize anycombination of licensed, shared, and unlicensed spectrum bands, amongothers. The flexibility of eCC symbol duration and subcarrier spacingmay allow for the use of eCC across multiple spectrums. In someexamples, NR shared spectrum may increase spectrum utilization andspectral efficiency, specifically through dynamic vertical (e.g., acrossthe frequency domain) and horizontal (e.g., across the time domain)sharing of resources.

A transmitting device (e.g., a base station 105) may broadcast controlinformation including one or more control channels, such as a physicalbroadcast control channel (PBCH); a primary synchronization signal(PSS); a secondary synchronization signal (SSS); a physical controlformat indicator channel (PCFICH); a physical HARQ indicator channel(PHICH); and/or a physical downlink control channel (PDCCH), etc., toone or more receiving devices (e.g., UEs 115). The PHICH carries HARQfeedback transmissions such as an acknowledgment (ACK) or negativeacknowledgment (NACK). HARQ may involve checking packet transmissions atthe receiving device for accuracy, and if confirmed, an ACK may betransmitted, whereas if not confirmed, a NACK may be transmitted. Inresponse to a NACK, the transmitting device may send a HARQretransmission, which may implement chase combining, incrementalredundancy, etc. HARQ retransmission may be performed for uplink trafficand downlink traffic.

Uplink and downlink transmissions may generally utilize a suitable errorcorrecting block code. In a typical block code (i.e., a codeword), aninformation message or sequence is split up into CBs, and an encoder atthe transmitting device then mathematically adds redundancy to theinformation message. Exploitation of this redundancy in the encodedinformation message can improve the reliability of the message, enablingcorrection for any bit errors that may occur due to the noise. Someexamples of error correcting codes include Hamming codes,Bose-Chaudhuri-Hocquenghem (BCH) codes, turbo codes, LDPC codes, andpolar codes. Various implementations of base stations 105 and UEs 115may include suitable hardware and capabilities (e.g., an encoder and/ordecoder) to utilize any one or more of these error correcting codes forwireless communication.

As noted above, LDPC codes may be one type of error correcting codeswhich use an iterative coding system. Regular LDPC codes may be linearblock codes (e.g., codewords) in which most of the elements of itsparity check matrix H are ‘0’. LDPC codes can be represented bybipartite graphs (often referred to as “Tanner graphs”). In a bipartitegraph, a set of variable nodes corresponds to bits of a codeword (e.g.,information bits or systematic bits), and a set of check nodescorresponds to a set of parity-check constraints that define the code.Edges in the graph connect variable nodes to check nodes. Thus, thenodes of the graph are separated into two distinctive sets with edgesconnecting nodes of two different types—variable and check.

Graphs as used in LDPC coding may be characterized in a variety ofmanners. A lifted code is created by copying a bipartite base graph (G)(or a protograph), a number of times, Z. The number of times is referredto herein as the lifting, lifting size, or lifting size value. Avariable node and a check node are considered “neighbors” if they areconnected by an “edge” (i.e., the line connecting the variable node andthe check node) in the graph. In addition, for each edge (e) of thebipartite base graph (G), a permutation (generally an integer valueassociated with the edge permutation that is represented by k andreferred to as the lifting value) is applied to the Z copies of edge (e)to interconnect the Z copies of the bipartite base graph (G). A bitsequence having a one-to-one association with the variable node sequenceis a valid codeword if and only if, for each check node, the bitsassociated with all neighboring variable nodes sum to 0 modulo 2 (i.e.,they include an even number of 1's). The resulting LDPC code may bequasi-cyclic (QC) if the permutations (liftings values) used are cyclic.Two base graphs may be defined based on a number of columns for eachgraph, resulting in two families of LDPC codes. For example, a firstbase graph may include 66 columns, and a second base graph may include50 columns. Codewords transmitted according to either base graph mayinclude a number of bits equal to the corresponding number of columnsmultiplied by a lifting size (Z).

In some cases, the error correcting codes (e.g., LDPC) may include acircular buffer that indicates how many bits a decoder has to decode fora codeword. The circular buffer may include different redundancyversions (RVs) to indicate where the bits for the codeword start withinan encoded information message, where four different types of RVs aredefined. For example, a first RV (e.g., a redundancy version zero (RV0))may indicate that the codeword starts at bit zero (0) of the encodedinformation message, a second RV (e.g., a redundancy version one (RV1))may indicate that the codeword starts at roughly the quarter mark of theencoded information message, a third RV (e.g., a redundancy version two(RV2)) may indicate that the codeword starts at the halfway mark of theencoded information message, and a fourth RV (e.g., a redundancy versionthree (RV3)) may indicate that the codeword starts at roughly thefive-sixths mark of the encoded information message. Once bits of theencoded information message reach the end of the encoded informationmessage for the second, third, and fourth RVs, the bits may wrap aroundto bit zero (0) of the encoded information message (e.g., circle aroundbased on the circular buffer). In some cases, initial transmissions maybe transmitted according to RV0 (e.g., the first RV).

TBs may be divided into smaller codeblocks, which may be bundledtogether to form multiple codeblock groups (CBGs) within the TB. Acodeword may be defined as the total number of codeblocks within the TBplus additional bits for error detection. A CBG may include one or morecodeblocks of the same TB. When one or more of the codeblocks is notsuccessfully transmitted to a receiving device (e.g., a UE 115), thereceiving device may transmit a NACK for the corresponding CBG thatincludes the unsuccessfully transmitted codeblock. In some cases, anACK/NACK feedback bit may be reserved for each CBG of the codeword. Foreach CBG for which a NACK has been transmitted, a transmitting device(e.g., a base station 105) may transmit those respective CBGs as part ofa subsequent transmission using a HARQ process, rather than transmittingthe entire TB in the subsequent transmission.

A UE 115 may be designed to sustain a peak decoding throughput based ona maximum TBS when decoding a received codeword in a corresponding TB.The maximum TBS may be based on a largest TBS transmitted in a PDSCHwithin a slot (e.g., fourteen symbols). In some cases, however, adecoding throughput may exceed the peak decoding throughput. Forexample, subsequent TBs may be transmitted at a lower code rate thancode rates for first (e.g., initial) transmissions of the TB, resultingin more time needed to decode the subsequent transmissions and anincreased decoding throughput (e.g., the UE 115 may attempt to decode asame number of codeblocks at the lower code rate, increasing the amountof time needed to decode the codeblocks). Accordingly, the UE 115 mayemploy LBRM to decode TBs with lower code rates by limiting the numberof codeblocks to rate-match and decode. However, additional scenariosmay exist that cause the decoding throughput to exceed the peak decodingthroughput.

In some cases, a high decoding throughput may be caused when a TB istransmitted as part of a subsequent transmission at or near a peak coderate, where the subsequent transmission of the TB is transmitted at asignificantly lower mother code rate than a code rate for LBRM (e.g.,2/3 rate). Additionally, multiple numerologies (e.g., SCSs) may beconfigured across different BWPs of a downlink when the TB istransmitted at or near the peak code rate further causing the higherdecoding throughput. For example, the decoding throughput may beincreased when one BWP has 100 MHz with 30 kHz SCS (e.g., a firstnumerology) and one BWP also has 100 MHz but with 60 kHz SCS (e.g., asecond numerology).

Additionally or alternatively, the decoding throughput may exceed thepeak decoding throughput when a TB is transmitted with a significantlylower mother code rate and with a much shorter PDSCH duration (L) than aslot duration. For example, the PDSCH duration may include seven (7)symbols or less. In some cases, the decoding throughput may not exceedthe peak decoding throughput for the shorter PDSCH duration if the UE115 is capable of processing the PDSCH across multiple slots (e.g.,processing capability 1) and may or may not exceed the peak decodingthroughput for the shorter PDSCH duration if the UE 115 is capable ofprocessing the PDSCH within one slot. Additionally or alternatively, thedecoding throughput may exceed the peak decoding throughput when asubsequent transmission of a TB (e.g., a retransmission) occurs on amuch shorter PDSCH duration than an initial TB transmission. Forexample, the initial TB transmission may occur on fourteen (14) symbolsand the subsequent transmission of the TB may occur on seven (7)symbols.

Accordingly, performance may not be expected to be optimized based onthe above described scenarios in which subsequent transmissions of a TBoccur at or near a peak coding rate. For example, the UE 115 may not beexpected to optimally decode a subsequent transmission of a TB when theTB is transmitted with a significantly lower code rate (consideringinitial transmission and subsequent transmission) than a code rate forLBRM (e.g., 2/3), the subsequent transmission occurs on a much shorterPDSCH duration than the initial transmission, or a combination thereof.However, more stringent requirements may be needed to prevent decodinghardware on the UE 115 from being overprovisioned.

Wireless communications system 100 may support efficient techniques foremploying a decodability condition based on a peak-throughput threshold(e.g., a predetermined decoding throughput threshold), where if adecoding throughput (e.g., an effective UE throughput) for a TB is abovethe threshold, a UE 115 is not required to decode the TB (or one or moresubsequent transmissions of the TB). The peak-throughput threshold maybe based on a maximum TBS, a throughput required to decode a TB of themaximum TBS transmitted in a fourteen-symbol duration, a number ofcodeblocks for transmitting a TB of the maximum TB size, a length of acodeblock-level CRC, a length of a TB-level CRC, a coding rate fortransmitting a TB of maximum TB size with LBRM enabled, a scalingfactor, or a combination thereof.

Additionally, the decoding throughput may be based on an SCS for the oneor more subsequent transmissions, a minimum SCS configured for a CC, anumber of transmitted codeblocks in the TB, a circular buffer size, aPDSCH duration for the one or more subsequent transmissions, a set ofTBs scheduled in a fourteen-consecutive-symbol duration, or anycombination thereof. Accordingly, the UE may decode one or moresubsequent transmissions of the TB if the decoding throughput is lessthan the predetermined decoding throughput threshold or may refrain fromdecoding the subsequent transmissions of the TB if the decodingthroughput exceeds the predetermined decoding throughput threshold.

FIG. 2 illustrates an example of a wireless communications system 200that supports resolving decodability for subsequent transmissions whosethroughput exceeds a threshold in accordance with aspects of the presentdisclosure. In some examples, wireless communications system 200 mayimplement aspects of wireless communications system 100. Wirelesscommunications system 200 may include a base station 105-a and a UE115-a, which may be examples of corresponding base stations 105 and UEs115 as described with reference to FIG. 1. As described herein, basestation 105-a and UE 115-a may support a LDPC coding scheme fortransmitting and receiving downlink information.

${\frac{{TBS}_{\max}}{14}{bits}},$

UE 115-a may be designed to sustain an information throughput foi where14 is the slot duration in symbols and TBS_(max) indicates a maximumTBS. For a more accurate number of bits for the throughput, CRC bits maybe included in the calculation, such that UE 115-a may sustaininformation throughput up to a predetermined decoding throughputthreshold (TP_(max)). TP_(max) may be given as follows in Equation 1.

$\begin{matrix}{{TP}_{\max} = {\frac{1}{R_{LBRM}}\frac{{TBS}_{\max} + {C_{\max} \cdot L_{{CB},{CRC}}} + L_{{TB},{CRC}}}{14}}} & (1)\end{matrix}$

where TBS_(max) is a maximum TBS, C_(max) is the number of codeblocks ina TB of size TBS_(max), L_(CB,CRC) is the length of the codeblock-levelCRC, L_(TB,CRC) is the length of the TB-level CRC, and R_(LBRM) is thecode rate associated with the LBRM. A codeblock-level CRC may be the CRCapplied to codeblocks of a TB, and a TB-level CRC may be the CRC appliedto the TB itself.

In some cases, a scaling factor (f) may be included when calculatingTP_(max). For example, f may be defined for all UEs 115 and TP_(max)calculations as indicated by the network (e.g., via base station 105-a).Additionally or alternatively, f may be a UE-capability for UE 115-a.Accordingly, f may increase or decrease TP_(max) by a small percentage(e.g., 10-20%) to provide an expanded or narrowed window of decodingthroughputs that may be close to the calculated TP_(max) (e.g., arelaxation for decoding throughputs). In some cases, f may be a fixedvalue (e.g., as indicated by base station 105-a, as a UE-capability ofUE 115-a, etc.) to adjust the range of decoding throughputs forTP_(max). When including f in the TP_(max) calculation, TP_(max) may begiven as follows by Equation 2.

$\begin{matrix}{{TP}_{\max} = {{f \cdot \frac{1}{R_{LBRM}}}\frac{{C_{\max} \cdot L_{{CB},{CRC}}} + L_{{TB},{CRC}}}{14}}} & (2)\end{matrix}$

Initially, UE 115-a may receive a first transmission with a TB from basestation 105-a. In some cases, as described herein, the firsttransmission may be received according to an RV0(e.g., the firstredundancy version as described above in FIG. 1, where the firsttransmission begins at a bit zero (0) of an encoded informationmessage). However, UE 115-a may be unable to decode the firsttransmission and request a subsequent transmission including the TB viatransmitting a NACK feedback message. Accordingly, base station 105-amay transmit a subsequent transmission 210 on resources of a carrier205. As described herein, subsequent transmission 210 may require adecoding throughput by a decoder 215 (e.g., decoding hardware in UE115-a) that exceeds TP_(max) as defined in Equation 1. For example, thedecoding throughput may exceed TP_(max) when subsequent transmission 210is transmitted with a significantly lower code rate than R_(LBRM) (e.g.,2/3), subsequent transmission 210 occurs on a much shorter PDSCHduration than the first transmission, or a combination thereof. In somecases, decoder 215 may be overprovisioned when attempting to decodesubsequent transmission 210.

To prevent overprovisioning decoder 215, an effective UE throughput forsubsequent transmission 210 may be defined such that if the effective UEthroughput exceeds TP_(max), decoder 215 (e.g., UE 115-a) may processsubsequent transmission 210 by refraining from decoding. Alternatively,UE 115-a may refrain from decoding the TB. For example, when subsequenttransmission 210 is one of several subsequent transmissions that includethe TB, UE 115-a may refrain from decoding either a) one of thesubsequent transmissions (e.g., the last or latest subsequenttransmission) of the TB or b) any of the subsequent transmissions of theTB. Thus, in one scenario, UE 115-a may effectively drop a TB byrefraining from decoding any subsequent transmission of the TB when theassociated effective UE throughput exceeds TP_(max). Alternatively, UE115-a may process subsequent transmission 210 by decoding some (e.g.,one or more) of the subsequent transmissions of the TB prior to (orwhile) determining the effective UE throughput, but drop the decodedsubsequent transmissions and cease decoding subsequent transmissions(e.g., refrain from decoding any additional subsequent transmissions ofthe TB) after UE 115-a determines that the associated effective UEthroughput exceeds TP_(max).

In some cases, a throughput for decoding a TB may be related to a PDSCHduration in symbols (L), a proportion of codeblocks transmitted(α_(CBG)), and the LDPC decoder code rate (R_(LBRM)). α_(CBG) may befurther defined as the ratio of transmitted codeblocks (C′) to a totalnumber of codeblocks in the TB (C) of subsequent transmission 210

$\left( {{e.g.},{\alpha_{CBG} = \frac{C^{\prime}}{C}}} \right),$

which can be calculated from codeblock group transmission information(CBGTI) in downlink control information (DCI). C′ may indicate thenumber of codeblocks UE 115-a may decode for subsequent transmission210. For example, subsequent transmission 210 may include a TB with 100codeblocks distributed in 10 CBGs of 10 codeblocks each. Accordingly, ifone or more codeblocks in one CBG are not received correctly initially,subsequent transmission 210 may only include the one CBG (e.g., 10codeblocks) and UE 115-a may decode the 10 codeblocks in the one CBG(e.g., C′=10). In some cases, α_(CBG) may equal one (1) if CBG-basedsubsequent transmission is not used for subsequent transmission 210(e.g., UE 115-a decodes all of the codeblocks transmitted).

R_(LDPC) may be given as

${\frac{K_{r}}{N_{cb}} = \frac{{TBS} + \left( {C \cdot L_{{CB},{CRC}}} \right) + L_{{TB},{CRC}}}{C \cdot N_{cb}}},$

where C is the number of codeblocks in the current TB of size TBS, K_(r)is the LDPC payload size, and N_(cb) is a circular buffer size (e.g.,maximum possible number of coded bits per codeblock without repetition).Accordingly, the decoding throughput for the TB may be defined below.

${\alpha_{CBG} \cdot \frac{1}{R_{LDPC}} \cdot \frac{{TBS} + \left( {C \cdot L_{{CB},{CRC}}} \right) + L_{{TB},{CRC}}}{L}} = {{\frac{C^{\prime}}{C} \cdot \frac{C \cdot N_{cb}}{{TBS} + \left( {C \cdot L_{{CB},{CRC}}} \right) + L_{{TB},{CRC}}} \cdot \frac{{TBS} + \left( {C \cdot L_{{CB},{CRC}}} \right) + L_{{TB},{CRC}}}{L}} = \frac{C^{\prime} \cdot N_{cb}}{L}}$

where C′ is the number of transmitted codeblocks in the TB, N_(cb) isthe circular buffer size for the TB, and L is the PDSCH duration insymbols. As such, a proposed decodability may be given as follows byEquation 3.

$\begin{matrix}{\frac{C^{\prime} \cdot N_{cb}}{L} > {TP}_{\max}} & (3)\end{matrix}$

Accordingly, UE 115-a may refrain from decoding a subsequenttransmission (e.g., subsequent transmission 210) of a TB when thecondition given by Equation 3 is satisfied. Alternatively, UE 115-a mayrefrain from decoding the TB at all (e.g., by refraining from decodingany of the subsequent transmissions of the TB, or by dropping decodedsubsequent transmissions and/or ceasing to decode any additionalsubsequent transmissions of the TB).

Additionally, UE 115-a may utilize Equation 3 for determining whether todecode subsequent transmission 210 if subsequent transmission 210 istransmitted not using an RV0 of a TB (e.g., if subsequent transmission210 is transmitted using RV1, RV2, or RV3 as described above in FIG. 1,indicating where subsequent transmission 210 begins within an encodedinformation message). For example, RV0 may not be expected to lower acode rate of the TB significantly to affect the decoding throughput ofthe TB, and as such, if the TB is transmitted with RV0, UE 115-a mayattempt to decode the TB. That is, UE 115-a may determine whether todecode based on the redundancy version used to transmit the TB.Alternatively, UE 115-a may determine whether to decode independent ofthe redundancy version used to transmit the TB. Further, Equation 3 maybe utilized when subsequent transmission 210 is transmitted in a PDSCHlonger than a mini-slot duration but may not account for SCS orback-to-back subsequent transmissions 210 with PDSCH durations ofmini-slots.

As shown in Equations 1 and 2, TP_(max) for UE 115-a may be calculatedindependent of SCS. However, an SCS-derived scaling factor (μ) may beadded to the decoding throughput of a TB to account for the change intime available for decoding when a CC contains BWPs, each with differentSCS, and the highest of the different SCSs is used when calculating thedecoding throughput. SCS may be defined as 15×2^(μ) kHz. μ₀ maycorrespond to a minimum SCS configured for a CC. In some cases, μ₀ mayindicate a maximum number of physical RBs (PRBs) across all configuredBWPs on a carrier and the minimum SCS that UE 115-a is able to decode. μmay correspond to the SCS of the current transmission. The decodabilitycondition may be updated from Equation 3 to account for one or moredifferent SCS values on a same CC and may be given as follows byEquation 4.

$\begin{matrix}{{2^{\mu - \mu_{0}} \cdot \frac{C^{\prime} \cdot N_{cb}}{L}} > {TP}_{\max}} & (4)\end{matrix}$

where μ relates to an SCS for subsequent transmission 210 such thatSCS=1·2^(μ), μ₀ relates to a minimum SCS configured for a CC, C′ is anumber of transmitted codeblocks in the TB, N_(cb) is a circular buffersize, and L is a PDSCH duration for subsequent transmission 210. In somecases, UE 115-a may utilize Equation 4 for determining how to processsubsequent transmission 210 if subsequent transmission 210 is nottransmitted using an RV0 of a TB (e.g., if the subsequent transmission210 is transmitted using a redundancy version other than RV0, such asRV1, RV2, or RV3). Alternatively, UE 115-a may use Equation 4 fordetermining how to process subsequent transmission 210 regardless of theredundancy version used (e.g., UE 115-a may use Equation 4 to determinewhether to decode even if subsequent transmission 210 is transmittedusing RV0). Further, Equation 3 may be utilized when subsequenttransmission 210 is transmitted in a PDSCH longer than a mini-slotduration and, as described herein, involves multiple SCS values.

In some cases, multiple PDSCH transmissions may occur in a duration of14 consecutive symbols. For example, back-to-back short PDSCHtransmissions (e.g., each lasting for a duration of a mini-slot oranother length less than 14 consecutive symbols) may occur such thatsubsequent transmission 210 includes two TBs transmitted in atransmission previous to the subsequent transmission 210. Accordingly,the decodability condition may be updated to accommodate multiple TBsand may be given as follows by Equation 5.

$\begin{matrix}{{2^{\mu - \mu_{0}} \cdot {\sum_{i\; \epsilon \; S}\frac{C_{i}^{\prime} \cdot N_{{cb},i}}{L_{i}}}} > {TP}_{\max}} & (5)\end{matrix}$

where μ relates to an SCS for one TB in subsequent transmission 210 suchthat SCS=1·2^(μ), μ₀ relates to a minimum SCS configured for a CC, C′ isa number of transmitted codeblocks in a current TB, N_(cb) is a circularbuffer size, L_(i) is a PDSCH duration for the current TB of subsequenttransmission 210, S is a set of TBs scheduled in afourteen-consecutive-symbol duration, and i may indicate each TB in setS. In some cases, Equation 5 may be used regardless of which RV is usedper TB (or per subsequent transmission). Alternatively, Equation 5 maybe used if subsequent transmission 210 does not use RV0 (e.g., ifsubsequent transmission 210 uses a redundancy version other than RV0).Additionally, L_(i) may be fixed at 14 symbols.

As given by Equation 5, if the decoding throughput for subsequenttransmission 210 (or any additional transmissions) causes UE 115-a toexceed TP_(max), UE 115-a (or decoder 215) may refrain from decodingsubsequent transmission 210. Alternatively, UE 115-a (or decoder 215)may refrain from decoding any of the TBs sent within thefourteen-consecutive-symbol duration (e.g., none of the TBs sent withinthe fourteen-consecutive-symbol duration may be decoded). For example,UE 115-a may refrain from decoding any of the TBs in set S. Thus, if twoTBs are sent in the fourteen-consecutive-symbol duration, UE 115-a mayrefrain from decoding both TBs, even if only one of the TBs (or onesubsequent transmission of one of the TBs) causes the condition inEquation 5 to be satisfied.

In some cases, when subsequent transmission 210 includes more than oneTB transmitted (e.g., retransmitted) within an active BWP, the PDSCHdurations of the more than one subsequently transmitted TBs may includedifferent durations within the active BWP. For example, the durations ofthe subsequently transmitted TBs may vary from two (2) OFDM symbols to14 OFDM symbols, such that the TB is transmitted with a shorter PDSCHduration (L) than a slot duration. Accordingly, TP_(max) may be definedas follows in Equation 6.

$\begin{matrix}{{TP}_{\; \max} = {\frac{1}{R_{LBRM}}\frac{{TBS}_{LBRM}}{14}}} & (6)\end{matrix}$

where TBS_(LBRM) is the maximum TB size with LBRM enabled, and whereR_(LBRM) is a coding rate when transmitting a TB of the maximum TB sizewith LBRM enabled (e.g., 2/3). Equation 6 may be derived from Equation1, where L_(CB,CRC) and L_(TB,CRC) go to zero (0) based on UE 115-arefraining from performing the CRC on the codeblock and TB when multipleTBs are included in subsequent transmission 210.

Additionally, when TP_(max) is defined by Equation 6 above, UE 115-a (ordecoder 215) may not be expected to handle decoding any TBs in a 14consecutive-symbol duration for a normal cyclic prefix (or 12consecutive-symbol duration for an extended cyclic prefix) ending at thelast symbol of the latest occurring PDSCH transmission within the activeBWP on a serving cell based on a decodability condition given as followsby Equation 7 (e.g., a PDSCH skipping rule).

$\begin{matrix}{{2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum_{i\; \epsilon \; S}{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot F_{i}}}} > {TP}_{\max}} & (7)\end{matrix}$

where μ relates to an SCS for the one or more TBs in subsequenttransmission 210 for the active BWP, μ′ corresponds to an SCS of a BWPacross all configured BWPs of a carrier that has a largest configurednumber of PRBs, C′_(i) is a number of scheduled codeblocks for an i^(th)TB, L_(i) is a PDSCH duration for the i^(th) TB, S is a set of TBsscheduled partially or fully in a consecutive-symbol duration for thei^(th) TB, and F_(i) is a number of coded bits in a codeblock and is amaximum value of a min(k_(0,i) ^(j)+E_(i) ^(j), N_(cb,i)), where k_(0,i)^(k) is a starting location of a redundancy value for a j^(th)transmission, E_(i) ^(j) is a min(E_(r)) of scheduled code blocks forthe j^(th) transmission, N_(cb,i) is a circular buffer length, where jranges from 0 to J−1, where J−1 is a current subsequent transmission forthe i^(th) TB. In some cases,

$2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum_{i\; \epsilon \; S}{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot F_{i}}}$

may represent the effective UE throughput (e.g., an initial UEthroughput) for UE 115-a (or decoder 215). Additionally,

$\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor$

may represent a floor function that takes a real number input calculatedby

$\frac{C_{i}^{\prime}}{L_{i}}$

(e.g., a decimal number in some cases) and outputs an integer less thanor equal to the real number input (e.g., the floor function rounds thereal number down to the lowest whole number of the real number input,such as 2.4 becomes 2 and 2.8 also becomes 2).

Equations 6 and 7 may assume the number of OFDM symbols of the one ormore TBs in subsequent transmission 210 are constant (e.g., 14 OFDMsymbols). However, in some cases, the number of OFDM symbols may differfrom TB to TB in an active BWP. Accordingly, in such cases, TP_(max) maybe defined as follows in Equation 8.

$\begin{matrix}{{TP}_{\; \max} = {\frac{1}{R_{LBRM}}{TBS}_{LBRM}}} & (8)\end{matrix}$

where TBS_(LBRM) is the maximum TB size with LBRM enabled, and whereR_(LBRM) is a coding rate when transmitting a TB of the maximum TB sizewith LBRM enabled (e.g., 2/3).

The decodability condition may similarly be adjusted to address thevariability in the number of OFDM symbols of the multiple TBs insubsequent transmission 210. For example, UE 115-a (or decoder 215) maynot be expected to handle decoding any TBs in a 14 consecutive-symbolduration for a normal cyclic prefix (or 12 consecutive-symbol durationfor an extended cyclic prefix) ending at the last symbol of the latestoccurring PDSCH transmission within the active BWP on a serving cellbased on a decodability condition given as follows by Equation 9 orEquation 9-1 or Equation 9-2 (e.g., the PDSCH skipping rule).

$\begin{matrix}{{2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum_{i\; \epsilon \; S}{{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot x_{i}}F_{i}}}} > {TP}_{\max}} & (9) \\{{2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum_{i\; \epsilon \; S}{\left\lfloor {\frac{C_{i}^{\prime}}{L_{i}}F_{i}} \right\rfloor \cdot x_{i}}}} > {TP}_{\max}} & \left( {9\text{-}1} \right) \\{{\sum\limits_{i \in S}{{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot x_{i}}F_{i}}} > {TP}_{\max}} & \left( {9\text{-}2} \right)\end{matrix}$

where μ relates to an SCS for the one or more TBs in subsequenttransmission 210 for the active BWP, μ′ corresponds to an SCS of a BWPacross all configured BWPs of a carrier that has a largest configurednumber of PRBs, C′_(i) is a number of scheduled codeblocks for an i^(th)TB, L_(i) is a PDSCH duration for the i^(th) TB, S is a set of TBsscheduled partially or fully in a consecutive-symbol duration for thei^(th) TB, x_(i) is a number of OFDM symbols of the one or moresubsequent transmissions of the i^(th) TB, and F_(i) is a number ofcoded bits in a codeblock and is a maximum value of a min(k_(0,i)^(j)+E_(i) ^(j), N_(cb,j)) where k_(0,i) ^(j) is a starting location ofa redundancy value for a j^(th) transmission, E_(i) ^(j) is a min(E_(r))of scheduled code blocks for the j^(th) transmission, N_(cb,i) is acircular buffer length, where j ranges from 0to J−1, where J−1 is acurrent subsequent transmission for the i^(th) TB. Based on a ratiobetween x_(i) and L_(i) (e.g., the OFDM symbols used for the subsequenttransmission of the TB compared with an allocated number of OFDMsymbols/duration of a PDSCH configured for a TB transmission, such asthe initial TB transmission, the subsequent transmission of the TB,etc.), UE 115-a (e.g., or the decoder 215) may scale the effective UEthroughput based on how many OFDM symbols are used for the subsequenttransmission of the TB. For example,

$2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum_{i\; \epsilon \; S}{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot F_{i}}}$

may represent an initial UE throughput for UE 115-a (or decoder 215),which is then scaled by the ratio between x_(i) and L_(i) for Equations9, 9-1, and 9-2. Additionally,

$\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \mspace{14mu} {and}\mspace{14mu} \left\lfloor {\frac{C_{i}^{\prime}}{L_{i}}F_{i}} \right\rfloor$

may represent floor functions as described above for the real numberinputs calculated by

${\frac{C_{i}^{\prime}}{L_{i}}\mspace{14mu} {and}\mspace{14mu} \frac{C_{i}^{\prime}}{L_{i}}F_{i}},$

respectively.

Equations 5 through 9 may assume that BWP switching may not occur fastenough to accommodate different SCSs for each TB. As such, multiple TBswithin a 14-symbol duration may be assumed to be of the same numerology(e.g., SCS). However, if BWP switching does occur within the same14-symbol duration, the decodability condition may be given as followsby Equation 10.

$\begin{matrix}{{\sum_{i\; \epsilon \; S}{2^{u_{i} - \mu_{0}} \cdot \frac{C_{i}^{\prime} \cdot N_{{cb},i}}{L_{i}}}} > {TP}_{\max}} & (10)\end{matrix}$

where μ_(i) relates to an SCS for a current TB in subsequenttransmission 210 such that SCS=15·2^(μ) ^(i) , μ₀ relates to a minimumSCS configured for a CC, C′ is a number of transmitted codeblocks in thecurrent TB, N_(cb) is a circular buffer size, L is a PDSCH duration forsubsequent transmission 210, S is a set of TBs scheduled in afourteen-consecutive-symbol duration, and i may indicate each TB in setS.

Equations 3-6 may assume that f is one (1) (e.g., TP_(max) is notscaled). However, Equation 5 may more generally be defined to include fas given by Equation 11.

$\begin{matrix}{{2^{u - \mu_{0}} \cdot {\sum_{i\; \epsilon \; S}\frac{C_{i}^{\prime} \cdot N_{{cb},i}}{L_{i}}}} > {f \cdot {TP}_{\max}}} & (11)\end{matrix}$

As noted above, f may provide an additional window around TP_(max) toaccommodate decoding throughputs that are near TP_(max). For example,TP_(max) may originally be calculated to be 10 gigabytes per second(GB/s), but the decoding throughput for subsequent transmission 210 maybe calculated as 10.1 GB/s. As such, it may be unnecessary to discountthe calculated decoding throughput and refrain from decoding subsequenttransmission 210 (or the TB) based on a small difference from TP_(max)(e.g., 1%). By including an f greater than 1 (e.g., f=1.1), UE 115-a maystill decode subsequent transmission 210 (or the TB) even though thedecoding throughput is greater than TP_(max).

Additionally, based on Equations 5-7, UE 115-a may not be required todecode a latest (e.g., last) subsequent transmission 210. For example,UE 115-a may receive multiple TBs in subsequent transmission 210, butrefrain from decoding the last received TB, while attempting to decodethe other received TB in subsequent transmission 210. Additionally oralternatively, UE 115-a may receive multiple subsequent transmissions210 and refrain from decoding the last received subsequent transmissionof the multiple subsequent transmissions 210. Or, UE 115-a may receivemultiple subsequent transmissions 210 and refrain from decoding any ofthe multiple subsequent transmissions 210.

Equation 11 may provide the most general decodability condition for UE115-a to determine how to process, including whether or not to decode,subsequent transmission 210 (e.g., determine whether UE 115-a isrequired to decode subsequent transmission 210). If the decodingthroughput

$\left( {{e.g.},{2^{u - \mu_{0}} \cdot {\sum_{i\; \epsilon \; S}\frac{C_{i}^{\prime} \cdot N_{{cb},i}}{L_{i}}}}} \right)$

is less than the predetermined decoding throughput threshold multipliedby the scaling factor (e.g., f·TP_(max)), then decoder 215 may decodesubsequent transmission 210 and respond accordingly. However, asdescribed herein, if the decoding exceeds the predetermined decodingthroughput threshold multiplied by the scaling factor, then decoder 215may refrain from decoding subsequent transmission 210. Consequently, UE115-a may transmit a NACK 225 on resources of a carrier 220 to basestation 105-a indicating that subsequent transmission 210 was notdecoded. In some cases, carriers 205 and 220 may be the same ordifferent carriers. After receiving NACK 225, base station 105-a mayattempt a further subsequent transmission or another mitigation toprovide UE 115-a with the correct downlink information.

Additionally or alternatively, the window length of the active BWP maynot be fixed (e.g., at 14 OFDM symbols). Accordingly, TP_(max) maygenerally be defined as follows in Equation 12.

$\begin{matrix}{{TP}_{\max} = {\frac{1}{R_{LBRM}}\frac{{TBS}_{LBRM} \cdot \text{window length}}{14}}} & (12)\end{matrix}$

where TBS_(LBRM) is the maximum TB size with LBRM enabled, the windowlength is a predefined number of consecutive symbols, and R_(LBRM) is acoding rate when transmitting a TB of the maximum TB size with LBRMenabled (e.g., 2/3).

Based on the window length not being fixed in the active BWP, thedecodability condition may be given as follows in Equation 13, where UE115-a (or decoder 215) is not required to decode the latest transmissionnot using RV0 based on the decodability condition given by Equation 13.Additionally, UE 115-a (or decoder 215) may evaluate the decodabilitycondition given by Equation 13 at the end of a TB.

$\begin{matrix}{{2^{\max {({0,{µ - µ^{\prime}}})}} \cdot {\sum\limits_{i \in S}{C_{i}^{\prime} \cdot F_{i}}}} > {TP}_{\max}} & (13)\end{matrix}$

where μ relates to an SCS for the one or more TBs in subsequenttransmission 210 for the active BWP, μ′ corresponds to an SCS of a BWPacross all configured BWPs of a carrier that has a largest configurednumber of PRBs, C′_(i) is a number of scheduled codeblocks for an i^(th)TB, S is a set of TBs scheduled partially or fully in aconsecutive-symbol duration for the i^(th) TB, and F_(i) is a maximumvalue of a min(k_(0,i) ^(j)+E_(i) ^(j), N_(cb,i)), where k_(0,i) ^(j) isa starting location of a redundancy value for a j^(th) transmission,E_(i) ^(j) is a min(E_(r)) of scheduled code blocks for the j^(th)transmission, N_(cb,i) is a circular buffer length, where j ranges from0 to J−1, where J−1 is a current retransmission for the i^(th) TB.

The decodability condition may be defined for all UEs 115. For example,if an effective code rate for UE 115-a exceeds a threshold (e.g., 0.95),UE 115-a may not be expected to decode subsequent transmission 210(e.g., UE 115-a may skip decoding subsequent transmission 210). Or, UE115-a may not be expected to decode the TB associated with subsequenttransmission 210. For example, when multiple subsequent transmissionsare scheduled for a TB, UE 115-a may refrain from decoding any of thesubsequent transmissions (e.g., none of the subsequent transmissions maybe decoded). Thus, UE 115-a may effectively drop the TB. In such cases,UE 115-a may transmit a NACK for each un-decoded subsequent transmission(e.g., for each subsequent transmission the UE 115-a opted not todecode).

In some cases, a scheduler (e.g., base station 105-a) may avoidtransmitting subsequent transmission 210 to UE 115-a if the decodabilitycondition is met, if the decodability threshold would be exceeded, etc.Additionally or alternatively, UE 115-a may still attempt to decodesubsequent transmission 210 and transmit HARQ feedback based on whethersubsequent transmission 210 is correctly decoded or not. A UE 115 may bedesigned to accommodate higher data rates than the data rates indicatedby the defined decodability condition. However, the scheduler may notassume the UE 115 can accommodate the higher data rates and still nottransmit subsequent transmission 210.

FIG. 3 illustrates an example of a process flow 300 that supportsresolving decodability for subsequent transmissions in accordance withaspects of the present disclosure. In some examples, process flow 300may implement aspects of wireless communications systems 100 and/or 200.Process flow 300 may include a base station 105-b and a UE 115-b, whichmay be examples of corresponding base stations 105 and UEs 115 asdescribed herein with reference to FIGS. 1 and 2. As described herein,base station 105-b and UE 115-b may support a LDPC coding scheme fortransmitting and receiving downlink information.

In the following description of the process flow 300, the operationsbetween UE 115-b and base station 105-b may be performed in differentorders or at different times. Certain operations may also be left out ofthe process flow 300, or other operations may be added to the processflow 300. It is to be understood that while UE 115-b is shown performinga number of the operations of process flow 300, any wireless device mayperform the operations shown.

At 305, UE 115-b may receive, from base station 105-b, a transmissionincluding a TB.

At 310, UE 115-b may attempt to decode the transmission.

At 315, UE 115-b may transmit a feedback message to base station 105-bindicating that at least a portion of the transmission including the TBwas unsuccessfully decoded.

At 320, UE 115-b may receive, from base station 105-b, one or moresubsequent transmissions of at least the TB. In some cases, UE 115-b mayrefrain from decoding any of the one or more subsequent transmissionsbased on the effective UE throughput of the one or more retransmissionsexceeding the predetermined decoding throughput threshold. Or UE 115-bmay refrain from decoding the portions of the subsequent transmissionsthat include the TB. In some cases, UE 115-b may refrain from decodingthe TB based on the effective UE throughput of the one or moresubsequent transmissions exceeding the predetermined decoding throughputthreshold. In some cases, a subsequent transmission of the one or moresubsequent transmissions may be a last-received subsequent transmission.

At 325, UE 115-b may process a subsequent transmission of the one ormore subsequent transmissions. Processing the subsequent transmissionmay include determining an effective UE throughput of the one or moresubsequent transmissions of at least the TB based on scaling an initialUE throughput (e.g., an unadjusted UE throughput, an effective UEthroughput for subsequent transmissions of at least the TB that have aduration equal to a duration of a PDSCH for the TB, etc.) based on afunction which is dependent at least upon a duration of a PDSCH for theTB and a number of OFDM symbols of the one or more subsequenttransmissions of at least the TB. Additionally, UE 115-b may thendetermine whether to attempt to decode a subsequent transmission of theone or more subsequent transmissions based on whether the effective UEthroughput (e.g., decoding throughput) of the one or more subsequenttransmissions exceeds a predetermined decoding throughput threshold. Insome cases, UE 115-b may refrain from decoding any of the one or moresubsequent transmissions based on the effective UE throughput of the oneor more subsequent transmissions exceeding the predetermined decodingthroughput threshold. In some cases, UE 115-b may refrain from decodingthe TB based on the effective UE throughput of the one or moresubsequent transmissions exceeding the predetermined decoding throughputthreshold.

In some cases, the predetermined decoding throughput threshold may bebased on a throughput for decoding a TB of a maximum TB size transmittedin a fourteen-symbol duration. Additionally, the predetermined decodingthroughput threshold may be based on a maximum TBS, a number ofcodeblocks for transmitting a TB of a maximum TB size, a length of acodeblock-level CRC, a length of a TB-level CRC, a coding rate fortransmitting a TB of maximum TB size with LBRM enabled, and a scalingfactor. For example, the predetermined decoding throughput threshold maybe given by

$\begin{matrix}{{TP}_{\max} = {{f \cdot \frac{1}{R_{LBRM}}}{\frac{{TBS}_{\max} + {C_{\max} \cdot L_{{CB},{CRC}}} + L_{{TB},{CRC}}}{14}.}}} & \left( {{e.g.},{{Equation}\mspace{14mu} 2}} \right)\end{matrix}$

In some cases, the scaling factor may be one. Alternatively, the scalingfactor may be greater than one.

In some cases, the effective UE throughput of the one or more subsequenttransmissions may be based on a number of transmitted codeblocks in theTB, a circular buffer size, and a PDSCH duration for the one or moresubsequent transmissions. Accordingly, the effective UE throughput ofthe subsequent transmission may be applicable for a subsequenttransmission whose PDSCH duration is greater than a mini-slot durationbut is not applicable for subsequent transmissions involving differentSCS values or back-to-back subsequent transmissions whose PDSCHdurations are of a mini-slot. For example, the effective UE throughputmay be given by

$\begin{matrix}{\frac{C^{\prime} \cdot N_{cb}}{L}.} & \left( {{e.g.},{{Equation}\mspace{14mu} 3}} \right)\end{matrix}$

In some cases, the mini-slot duration may include a duration for a shortPDSCH or any duration less than 14 OFDM symbols, where the effective UEthroughput is applicable for the subsequent transmission with a PDSCHduration that is greater than this shortened duration of time indicatedby the mini-slot duration.

Additionally or alternatively, the effective UE throughput of the one ormore subsequent transmissions may be further based on an SCS of thesubsequent transmission and a minimum sub-carrier spacing of a componentcarrier carrying the one or more subsequent transmissions. Accordingly,the effective UE throughput of the subsequent transmission is applicablefor a subsequent transmission whose PDSCH duration is greater than amini-slot duration and is applicable for a subsequent transmissioninvolving different SCS values than the transmission including the TB.For example, the effective UE throughput may be given as

$\begin{matrix}{2^{µ - µ_{0}} \cdot {\frac{C^{\prime} \cdot N_{cb}}{L}.}} & \left( {{e.g.},{{Equation}\mspace{14mu} 4}} \right)\end{matrix}$

Additionally or alternatively, the effective UE throughput of the one ormore subsequent transmissions may be further based on a sum of UEthroughputs for multiple TBs in the one or more subsequenttransmissions. For example, the effective UE throughput may be given as

$\begin{matrix}{2^{µ - µ_{0}} \cdot {\sum_{i\; \epsilon \; S}{\frac{C_{i}^{\prime} \cdot N_{cb}}{L_{i}}.}}} & \left( {{e.g.},{{Equation}\mspace{14mu} 5}} \right)\end{matrix}$

In some cases, the duration of a PDSCH may be fixed at 14 symbols, suchthat the effective UE throughput may be given as

$2^{µ - µ_{0}} \cdot {\sum_{i\; \epsilon \; S}{\frac{C_{i}^{\prime} \cdot N_{{cb},i}}{14}.}}$

Additionally or alternatively, the length of the multiple TBs within theone or more subsequent transmissions may vary from TB to TB.Accordingly, in such cases, TP_(max) may be defined as

$\begin{matrix}{\frac{1}{R_{LBRM}}{\frac{{TBS}_{LBRM}}{14}.}} & \left( {{e.g.},{{Equation}\mspace{14mu} 6}} \right)\end{matrix}$

The effective UE throughput of the one or more subsequent transmissionsmay be further based on the variable lengths for multiple TBs in the oneor more subsequent transmissions. For example, the effective UEthroughput may be given as

$\begin{matrix}{2^{\max {({0,{µ - µ^{\prime}}})}} \cdot {\sum_{i \in S}{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot {F_{i}.}}}} & \left( {{e.g.},{{Equation}\mspace{14mu} 7}} \right)\end{matrix}$

In some cases,

$2^{\max {({0,{µ - µ^{\prime}}})}} \cdot {\sum_{i \in S}{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot F_{i}}}$

may be referred to as the initial UE throughput as indicated above whichis scaled based on the duration of a PDSCH for the TB and the number ofOFDM symbols of the one or more subsequent transmissions of at least theTB. Additionally, the effective UE throughput of the subsequenttransmission may be evaluated for an interval ending at an end of a lastsymbol of a latest PDSCH transmission when the multiple TBs vary inlength.

Additionally, when the length of the TBs vary, the length of PDSCH forthe TBs may not be fixed (e.g., at 14 OFDM symbols). As such, TP_(max)may be defined as

$\begin{matrix}{\frac{1}{R_{LBRM}}{{TBS}_{LBRM}.}} & \left( {{e.g.},{{Equation}\mspace{14mu} 8}} \right)\end{matrix}$

The effective UE throughput of the one or more subsequent transmissionsmay further based on the variable lengths for multiple TBs in the one ormore subsequent transmissions and the length of the PDSCHs. For example,the effective UE throughput may be given as

$\begin{matrix}{2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum_{i\; \epsilon \; S}{{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot x_{i}}F_{i}\mspace{14mu} {or}}}} & \left( {{e.g.},\; {{Equation}\mspace{14mu} 9}} \right) \\{2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum_{i\; \epsilon \; S}{{\left\lfloor {\frac{C_{i}^{\prime}}{L_{i}}F_{i}} \right\rfloor \cdot x_{i}}\mspace{14mu} {or}}}} & \left( {{e.g.},\; {{Equation}\mspace{14mu} 9\text{-}1}} \right) \\{\sum_{i \in S}{{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot x_{i}}{F_{i}.}}} & \left( {{e.g.},\; {{Equation}\mspace{14mu} 9\text{-}2}} \right)\end{matrix}$

Accordingly, UE 115-b may scale the effective UE throughput (e.g., theinitial UE throughput,

$\left. {2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum_{i \in S}{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot F_{i}}}} \right)$

based on the variable lengths for multiple TBs (e.g., based on a ratioof x_(i) to L_(i)). Additionally, for this throughput, the effective UEthroughput of the subsequent transmission may be evaluated for aninterval ending at an end of a last symbol of a latest PDSCHtransmission.

In some cases, the active BWP may not be fixed at a set number of OFDMsymbols (e.g., 14 OFDM symbols). As such, TP_(max) may be defined as

$\begin{matrix}{\frac{1}{R_{LBRM}}{\frac{{TBS}_{LBRM} \cdot \text{window length}}{14}.}} & \left( {{e.g.},\; {{Equation}\mspace{14mu} 12}} \right)\end{matrix}$

Additionally, the effective UE throughput may be given as2^(max(0,μ−μ′))·Σ_(i∈S)C′_(i)·F_(i) (e.g., Equation 13). Accordingly,the effective UE throughput of the subsequent transmission may beevaluated at an end of a TB.

In some cases, the effective UE throughput of the one or more subsequenttransmissions may be applicable for subsequent transmissions that arenot using a RV0, RV0 indicating the subsequent transmissions begin at abit zero of an encoded information message. Additionally oralternatively, the effective UE throughput of the one or more subsequenttransmissions may be applicable regardless of a redundancy version usedby the one or more subsequent transmissions, the redundancy versionindicating a location in an encoded information message where the one ormore subsequent transmissions begin.

At 330, UE 115-b may decode the subsequent transmission based on theeffective UE throughput of the one or more subsequent transmissionsbeing less than the predetermined decoding throughput threshold.

At 335, UE 115-b may refrain from decoding the subsequent transmissionbased on the effective UE throughput of the one or more subsequenttransmissions exceeding the predetermined decoding throughput threshold.

FIG. 4 shows a block diagram 400 of a device 405 that supports resolvingdecodability for subsequent transmissions in accordance with aspects ofthe present disclosure. The device 405 may be an example of aspects of aUE 115 as described herein. The device 405 may include a receiver 410, acommunications manager 415, and a transmitter 420. The device 405 mayalso include a processor. Each of these components may be incommunication with one another (e.g., via one or more buses).

The receiver 410 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to resolvingdecodability for subsequent transmissions whose throughput exceeds athreshold, etc.). Information may be passed on to other components ofthe device 405, such as the communications manager 415. The receiver 410may be an example of aspects of the transceiver 720 described withreference to FIG. 7. The receiver 410 may utilize a single antenna or aset of antennas.

The communications manager 415 may receive, from a base station via thereceiver 410, a transmission including a TB, attempt to decode thetransmission, transmit a feedback message to the base station indicatingthat at least a portion of the transmission including the TB wasunsuccessfully decoded, and receive, from the base station via thereceiver 410, one or more subsequent transmissions of at least the TB.In some cases, the communications manager 415 may process the one ormore subsequent transmissions of at least the TB by determining aneffective UE throughput of the one or more subsequent transmissions ofat least the TB based on scaling an initial UE throughput using afunction which is dependent at least upon a duration of a PDSCH for theTB and a number of OFDM symbols of the one or more subsequenttransmissions of at least the TB. Additionally, in processing the one ormore subsequent transmissions of at least the TB, the communicationsmanager 415 may determine whether to attempt to decode a subsequenttransmission based on whether the effective UE throughput of the one ormore subsequent transmissions exceeds a predetermined decodingthroughput threshold. The communications manager 415 may be an exampleof aspects of the communications manager 710 described herein.

Based on the actions performed by the communications manager 415 asdescribed herein, a UE 115 may reduce battery power consumption bydetermining to decode a subsequent transmission (e.g., of at least a TB)based on an effective UE throughput exceeding a predetermined decodingthroughput threshold. For example, rather than wasting battery powerattempting to decode the subsequent transmission at a higher throughputthan supported by the UE, the UE may refrain from decoding thesubsequent transmission, thereby saving power.

The communications manager 415, or its sub-components, may beimplemented in hardware, code (e.g., software or firmware) executed by aprocessor, or any combination thereof. If implemented in code executedby a processor, the functions of the communications manager 415, or itssub-components may be executed by a general-purpose processor, a digitalsignal processor (DSP), an application-specific integrated circuit(ASIC), a field-programmable gate array (FPGA) or other programmablelogic device (PLD), discrete gate or transistor logic, discrete hardwarecomponents, or any combination thereof designed to perform the functionsdescribed in the present disclosure.

The communications manager 415, or its sub-components, may be physicallylocated at various positions, including being distributed such thatportions of functions are implemented at different physical locations byone or more physical components. In some examples, the communicationsmanager 415, or its sub-components, may be a separate and distinctcomponent in accordance with various aspects of the present disclosure.In some examples, the communications manager 415, or its sub-components,may be combined with one or more other hardware components, includingbut not limited to an input/output (I/O) component, a transceiver, anetwork server, another computing device, one or more other componentsdescribed in the present disclosure, or a combination thereof inaccordance with various aspects of the present disclosure.

The transmitter 420 may transmit signals generated by other componentsof the device 405. In some examples, the transmitter 420 may becollocated with a receiver 410 in a transceiver module. For example, thetransmitter 420 may be an example of aspects of the transceiver 720described with reference to FIG. 7. The transmitter 420 may utilize asingle antenna or a set of antennas.

FIG. 5 shows a block diagram 500 of a device 505 that supports resolvingdecodability for subsequent transmissions in accordance with aspects ofthe present disclosure. The device 505 may be an example of aspects of adevice 405 or a UE 115 as described herein. The device 505 may include areceiver 510, a communications manager 515, and a transmitter 545. Thedevice 505 may also include a processor. Each of these components may bein communication with one another (e.g., via one or more buses).

The receiver 510 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to resolvingdecodability for subsequent transmissions whose throughput exceeds athreshold, etc.). Information may be passed on to other components ofthe device 505, such as the communications manager 515. The receiver 510may be an example of aspects of the transceiver 720 described withreference to FIG. 7. The receiver 510 may utilize a single antenna or aset of antennas.

The communications manager 515 may be an example of aspects of thecommunications manager 415 as described herein. The communicationsmanager 515 may be operative to process subsequent transmissions of a TBand may include a TB receiver 520, a decoder 525, a feedback component530, a subsequent transmission receiver 535, and a subsequenttransmission decoder 540. The communications manager 515 may be anexample of aspects of the communications manager 710 described herein.

The TB receiver 520 may receive, from a base station via the receiver510, a transmission including a TB.

The decoder 525 may attempt to decode the transmission.

The feedback component 530 may transmit a feedback message to the basestation indicating that at least a portion of the transmission includingthe TB was unsuccessfully decoded.

The subsequent transmission receiver 535 may receive, from the basestation via the receiver 510, one or more subsequent transmissions of atleast the TB.

The subsequent transmission decoder 540 may determine an effective UEthroughput of the one or more subsequent transmissions of at least theTB based on scaling an initial UE throughput based on a function whichis dependent at least upon a duration of a PDSCH for the TB and a numberof OFDM symbols of the one or more subsequent transmissions of at leastthe TB. Additionally, the subsequent transmission decoder 540 mayprocess (e.g., determine whether to attempt to decode) a subsequenttransmission of the one or more subsequent transmissions based onwhether the effective UE throughput of the one or more subsequenttransmissions exceeds a predetermined decoding throughput threshold.

Based on determining whether to attempt to decode the subsequenttransmission, a processor of a UE 115 (e.g., controlling the receiver510, the transmitter 545, or a transceiver 720 as described withreference to FIG. 7) may prevent overburdening other components withinthe UE 115. For example, a decoder within the UE 115 may be unable toprocess a subsequent transmission that is transmitted above thepredetermined decoding throughput threshold. However, the decoder maystill try to process the subsequent transmission and becomeoverburdened, expending unnecessary power and impacting systemperformance of the UE 115. Accordingly, by determining whether toattempt the decode prior to performing the decoding, the processor mayprevent from overloading the decoder (e.g., and any associatedcomponents).

The transmitter 545 may transmit signals generated by other componentsof the device 505. In some examples, the transmitter 545 may becollocated with a receiver 510 in a transceiver module. For example, thetransmitter 545 may be an example of aspects of the transceiver 720described with reference to FIG. 7. The transmitter 545 may utilize asingle antenna or a set of antennas.

FIG. 6 shows a block diagram 600 of a communications manager 605 thatsupports resolving decodability for subsequent transmissions inaccordance with aspects of the present disclosure. The communicationsmanager 605 may be an example of aspects of a communications manager415, a communications manager 515, or a communications manager 710described herein. The communications manager 605 may include a TBreceiver 610, a decoder 615, a feedback component 620, a subsequenttransmission receiver 625, and a subsequent transmission decoder 630.Each of these modules may communicate, directly or indirectly, with oneanother (e.g., via one or more buses).

The TB receiver 610 may receive, from a base station, a transmissionincluding a TB.

The decoder 615 may attempt to decode the transmission.

The feedback component 620 may transmit a feedback message to the basestation indicating that at least a portion of the transmission includingthe TB was unsuccessfully decoded.

The subsequent transmission receiver 625 may receive, from the basestation, one or more subsequent transmissions of at least the TB and mayprocess one or more subsequent transmissions of at least the TBaccording to a decodability condition. In some cases, the subsequenttransmission of the one or more subsequent transmissions is alast-received subsequent transmission.

The subsequent transmission decoder 630 may determine an effective UEthroughput of the one or more subsequent transmissions of at least theTB based on scaling an initial UE throughput based on a function whichis dependent at least upon a duration of a PDSCH for the TB and a numberof OFDM symbols of the one or more subsequent transmissions of at leastthe TB. Additionally, the subsequent transmission decoder 630 mayprocess (e.g., determine whether to attempt to decode) a subsequenttransmission of the one or more subsequent transmissions based onwhether an effective UE throughput of the one or more subsequenttransmissions exceeds a predetermined decoding throughput threshold.

In some examples, the subsequent transmission decoder 630 may decode thesubsequent transmission based on the effective UE throughput of the oneor more subsequent transmissions being less than the predetermineddecoding throughput threshold. Additionally or alternatively, thesubsequent transmission decoder 630 may refrain from decoding thesubsequent transmission based on the effective UE throughput of the oneor more subsequent transmissions exceeding the predetermined decodingthroughput threshold. In some cases, the subsequent transmission decoder630 may refrain from decoding any of the one or more subsequenttransmissions based on the effective UE throughput of the one or moresubsequent transmissions exceeding the predetermined decoding throughputthreshold. In some cases, the subsequent transmission decoder 630 mayrefrain from decoding the TB of the one or more subsequent transmissionsbased on the effective UE throughput of the one or more subsequenttransmissions exceeding the predetermined decoding throughput threshold.

In some cases, the predetermined decoding throughput threshold may bebased on a throughput for decoding a TB of a maximum TB size transmittedin a fourteen-symbol duration. Additionally, the predetermined decodingthroughput threshold may be based on a maximum TB size, a number ofcodeblocks for transmitting a TB of a maximum TB size, a length of acodeblock-level CRC, a length of a TB-level CRC, a coding rate fortransmitting a TB of maximum TB size with LBRM enabled, and a scalingfactor. For example, the predetermined decoding throughput threshold maybe defined as

${{TP}_{\max} = {{f.\frac{1}{R_{LBRM}}}\frac{{TBS}_{\max} + {C_{\max} \cdot L_{{CB},{CRC}}} + L_{{TB},{CRC}}}{14}}},$

where f is a fixed scaling factor, C_(max) is a number of codeblocksrequired to transmit a TB of maximum TB size, L_(CB,CRC) is the lengthof the codeblock-level CRC, L_(TB,CRC) is the length of the TB-levelCRC, and R_(LBRM) is a coding rate when transmitting a TB of maximum TBsize with LBRM enabled. In some cases, f may be one. Additionally oralternatively, f may be greater than one.

In some cases, the effective UE throughput of the one or more subsequenttransmissions may further be based on a sub-carrier spacing of thesubsequent transmission and a minimum sub-carrier spacing of a componentcarrier carrying the one or more subsequent transmissions. Additionally,the effective UE throughput of the one or more subsequent transmissionsis further based on a sum of UE throughputs for multiple TBs in the oneor more subsequent transmissions. For example, the effective UEthroughput of the subsequent transmission may be defined as

${2^{\mu - \mu_{0}} \cdot {\sum_{i\; \epsilon \; S}\frac{C_{i}^{\prime} \cdot N_{{cb},i}}{L_{i}}}},$

where μ relates to an SCS for the one or more subsequent transmissionssuch that SCS=b 15·2 ^(μ), μ₀ relates to a minimum SCS configured for acomponent carrier, C′ is a number of transmitted codeblocks in the TB,N_(cb) is a circular buffer size, L is a PDSCH duration for the one ormore subsequent transmissions, and S is a set of TBs scheduled in afourteen-consecutive-symbol duration. Additionally or alternatively, theeffective UE throughput of the subsequent transmission may be defined as

${2^{\mu - \mu_{0}} \cdot {\sum_{i\; \epsilon \; S}\frac{C_{i}^{\prime} \cdot N_{{cb},i}}{14}}},$

where μ relates to an SCS for the one or more subsequent transmissionssuch that SCS=15·2^(μ), μ₀ relates to a minimum SCS configured for acomponent carrier, C′ is a number of transmitted codeblocks in the TB,N_(cb) is a circular buffer size, and S is a set of TBs scheduled in afourteen-consecutive-symbol duration.

In some cases, the effective UE throughput of the one or more subsequenttransmissions is based on a number of transmitted codeblocks in the TB,a circular buffer size, and a PDSCH duration for the one or moresubsequent transmissions. For example, the effective UE throughput ofthe subsequent transmission may be defined as

$\frac{C^{\prime} \cdot N_{cb}}{L},$

where C′ is a number of transmitted codeblocks in the TB, N_(cb) is acircular buffer size, and L is a PDSCH duration for the subsequenttransmission. Accordingly, the effective UE throughput of the subsequenttransmission may be applicable for a subsequent transmission whose PDSCHduration is greater than a mini-slot duration but is not applicable forsubsequent transmissions involving different SCS values or back-to-backsubsequent transmissions whose PDSCH durations are of a mini-slot.

In some cases, the effective UE throughput of the subsequenttransmission may be applicable for a subsequent transmission whose PDSCHduration is greater than a mini-slot duration and is applicable for asubsequent transmission involving different SCS values than thetransmission including the TB. For example, the effective UE throughputof the subsequent transmission may be defined as

${2^{\mu - \mu_{0}} \cdot \frac{C^{\prime} \cdot N_{cb}}{L}},$

where μ relates to an SCS for the subsequent transmission such thatSCS=15·2^(μ), μ₀ relates to a minimum SCS configured for a componentcarrier, C′ is a number of transmitted codeblocks in the TB, N_(cb) is acircular buffer size, and L is a PDSCH duration for the subsequenttransmission.

In some cases, TP_(max) may be defined as

${{TP}_{\max} = {\frac{1}{R_{LBRM}}\frac{{TBS}_{LBRM}}{14}}},$

where TBS_(LBRM) is a maximum TB size with LBRM enabled and R_(LBRM) isa coding rate when transmitting a TB of the maximum TB size with LBRMenabled. For example, the length of PDSCH durations may vary from TB toTB, resulting in the above defined TP_(max). Additionally, the effectiveUE throughput (e.g., initial UE throughput) of the subsequenttransmission may be defined as

${2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum_{i \in S}{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot F_{i}}}},$

where μ relates to an SCS for the one or more subsequent transmissionsfor an active BWP, μ′ if corresponds to an SCS of a BWP across allconfigured BWPs of a carrier that has a largest configured number ofPRBs, C′_(i) is a number of scheduled codeblocks for an i^(th) TB, L_(i)is a PDSCH duration for the i^(th) TB, S is a set of TBs scheduledpartially or fully in a consecutive-symbol duration for the i^(th) TB,and F_(i) is a number of coded bits in a codeblock and is a maximumvalue of a min(k_(0,i) ^(j)+E_(i) ^(j), N_(cb,i)), where k_(0,i) ^(j) isa starting location of a redundancy value for a jth transmission, E_(i)^(j) is a min(E_(r)) of scheduled code blocks for the jth transmission,N_(cb,i) is a circular buffer length, where j ranges from 0 to J−1,where J−1 is a current subsequent transmission for the i^(th) TB.Additionally, the effective UE throughput of the subsequent transmissionmay be evaluated for an interval ending at an end of a last symbol of alatest PDSCH transmission.

Additionally,

$\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor$

may represent a floor function for the real number calculated by

$\frac{C_{i}^{\prime}}{L_{i}}.$

In some cases, in addition to the PDSCH durations varying, the length ofthe subsequent transmissions of each TB may vary. For example, TP_(max)may be defined as

${{TP}_{\max} = {\frac{1}{R_{LBRM}}{TBS}_{LBRM}}},$

where TBS_(LBRM) is a maximum TB size with LBRM enabled, and whereR_(LBRM) is a coding rate when transmitting a TB of the maximum TB sizewith LBRM enabled. Additionally, the effective UE throughput of thesubsequent transmission may be defined as

${2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum_{i \in S}{{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot x_{i}}F_{i}\mspace{14mu} {or}\mspace{14mu} {2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum_{i \in S}{\left\lfloor {\frac{C_{i}^{\prime}}{L_{i}}F_{i}} \right\rfloor \cdot x_{i}}}}}}},$

where μ relates to an SCS for the one or more subsequent transmissionsfor an active BWP, μ′ corresponds to an SCS of a BWP across allconfigured BWPs of a carrier that has a largest configured number ofPRBs, C′_(i) is a number of scheduled codeblocks for an i^(th) TB, L_(i)is a PDSCH duration for the i^(th) TB, S is a set of TBs scheduledpartially or fully in a consecutive-symbol duration for the i^(th) TB,x_(i) is a number of OFDM symbols of the one or more subsequenttransmissions of the i^(th) TB, and F_(i) is a number of coded bits in acodeblock and is a maximum value of a min(k_(0,i) ^(j)+E_(i) ^(k),N_(cb,i)), where k_(0,i) ^(j) is a starting location of a redundancyvalue for a j^(th) transmission, E_(i) ^(j) is a min(E_(r)) of scheduledcode blocks for the j^(th) transmission, N_(cb,i) is a circular bufferlength, where j ranges from 0 to J−1, where J−1 is a current subsequenttransmission for the i^(th) TB. Based on these equations, the effectiveUE throughput (e.g., initial UE throughput,

$\left. {2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum_{i \in S}{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot F_{i}}}} \right)$

may be scaled based on the ratio between x_(i) (e.g., the number of OFDMsymbols that the subsequent transmission of the i^(th) TB uses) andL_(i) (e.g., the total number of OFDM symbols allocated to a PDSCH forthe subsequent transmission of the i^(th) TB). Additionally, theeffective UE throughput of the subsequent transmission may be evaluatedfor an interval ending at an end of a last symbol of a latest PDSCHtransmission. Additionally

$\left\lfloor \frac{C_{i^{\prime}}}{L_{i}} \right\rfloor \mspace{14mu} {and}\mspace{14mu} \left\lfloor {\frac{C_{i^{\prime}}}{L_{i}}F_{i}} \right\rfloor$

may represent floor functions as described above for the real numberinputs calculated by

${\frac{C_{i^{\prime}}}{L_{i}}\mspace{14mu} {and}\mspace{14mu} \frac{C_{i^{\prime}}}{L_{i}}F_{i}},$

respectively.

In some cases, the length of the active BWP may not be fixed at a setlength (e.g., 14 OFDM symbols), which may affect TP_(max) and theeffective UE throughput of the subsequent transmission. For example,TP_(max) may be defined as

${{TP}_{\max} = {\frac{1}{R_{LBRM}}\frac{{{TBS}_{LBRM} \cdot {window}}\mspace{14mu} {length}}{14}}},$

where TBS_(LBRM) is a maximum TB size with LBRM enabled, the windowlength is a predefined number of consecutive symbols, and where R_(LBRM)is a coding rate when transmitting a TB of the maximum TB size with LBRMenabled. Additionally, the effective UE throughput of the subsequenttransmission may be defined as 2^(max(0,μ−82 ′))·Σ_(i∈S) C′_(i)·F_(i),where μ relates to an SCS for the one or more subsequent transmissionsfor an active BWP, μ corresponds to an SCS of a BWP across allconfigured BWPs of a carrier that has a largest configured number ofPRBs, C′_(i) is a number of scheduled codeblocks for an i^(th) TB, S isa set of TBs scheduled partially or fully in a consecutive-symbolduration for the i^(th) TB, and F_(i) is a number of coded bits in acodeblock and is a maximum value of a min(k_(0,i) ^(j)+E_(i) ^(j),N_(cb,i)), where k_(0,i) ^(j) is a starting location of a redundancyvalue for a j^(th) transmission, E_(i) ^(j) is a min(E_(r)) of scheduledcode blocks for the j^(th) transmission, N_(cb,i) is a circular bufferlength, where j ranges from 0 to J−1, where J−1 is a current subsequenttransmission for the i^(th) TB. Additionally, the effective UEthroughput of the subsequent transmission may be evaluated at an end ofa TB.

In some cases, the effective UE throughput of the one or more subsequenttransmissions may be applicable for subsequent transmissions that arenot using redundancy version zero, where the redundancy version zeroindicates the subsequent transmissions begin at a bit zero of an encodedinformation message. Additionally or alternatively, the effective UEthroughput of the one or more subsequent transmissions may be applicableregardless of a redundancy version used by the one or more subsequenttransmissions, where the redundancy version indicates a location in anencoded information message where the one or more subsequenttransmissions begin.

FIG. 7 shows a diagram of a system 700 including a device 705 thatsupports resolving decodability for subsequent transmissions inaccordance with aspects of the present disclosure. The device 705 may bean example of or include the components of device 405, device 505, or aUE 115 as described herein. The device 705 may include components forbi-directional voice and data communications including components fortransmitting and receiving communications, including a communicationsmanager 710, an I/O controller 715, a transceiver 720, an antenna 725,memory 730, and a processor 740. These components may be in electroniccommunication via one or more buses (e.g., bus 745).

The communications manager 710 may receive, from a base station, atransmission including a TB, attempt to decode the transmission,transmit a feedback message to the base station indicating that at leasta portion of the transmission including the TB was unsuccessfullydecoded, receive, from the base station, one or more subsequenttransmissions of at least the TB, and process the subsequenttransmissions of at least the TB. In some cases, the communicationsmanager 710 may determine an effective UE throughput of the one or moresubsequent transmissions of at least the TB based on scaling an initialUE throughput based on a function which is dependent at least upon aduration of a PDSCH for the TB and a number of OFDM symbols of the oneor more subsequent transmissions of at least the TB. Additionally, thecommunications manager 710 may process (e.g., determine whether toattempt to decode) a subsequent transmission of the one or moresubsequent transmissions based on whether the effective UE throughput ofthe one or more subsequent transmissions exceeds a predetermineddecoding throughput threshold.

The I/O controller 715 may manage input and output signals for thedevice 705. The I/O controller 715 may also manage peripherals notintegrated into the device 705. In some cases, the I/O controller 715may represent a physical connection or port to an external peripheral.In some cases, the I/O controller 715 may utilize an operating systemsuch as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, oranother known operating system. In other cases, the I/O controller 715may represent or interact with a modem, a keyboard, a mouse, atouchscreen, or a similar device. In some cases, the I/O controller 715may be implemented as part of a processor. In some cases, a user mayinteract with the device 705 via the I/O controller 715 or via hardwarecomponents controlled by the I/O controller 715.

The transceiver 720 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described herein. For example, thetransceiver 720 may represent a wireless transceiver and may communicatebi-directionally with another wireless transceiver. The transceiver 720may also include a modem to modulate the packets and provide themodulated packets to the antennas for transmission, and to demodulatepackets received from the antennas.

In some cases, the wireless device may include a single antenna 725.However, in some cases the device may have more than one antenna 725,which may be capable of concurrently transmitting or receiving multiplewireless transmissions.

The memory 730 may include random-access memory (RAM) and read-onlymemory (ROM). The memory 730 may store computer-readable,computer-executable code 735 including instructions that, when executed,cause the processor to perform various functions described herein. Insome cases, the memory 730 may contain, among other things, a basic I/Osystem (BIOS) which may control basic hardware or software operationsuch as the interaction with peripheral components or devices.

The processor 740 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a central processing unit (CPU), amicrocontroller, an ASIC, an FPGA, a PLD, a discrete gate or transistorlogic component, a discrete hardware component, or any combinationthereof). In some cases, the processor 740 may be configured to operatea memory array using a memory controller. In other cases, a memorycontroller may be integrated into the processor 740. The processor 740may be configured to execute computer-readable instructions stored in amemory (e.g., the memory 730) to cause the device 705 to perform variousfunctions (e.g., functions or tasks supporting resolving decodabilityfor subsequent transmissions whose throughput exceeds a threshold).

The code 735 may include instructions to implement aspects of thepresent disclosure, including instructions to support wirelesscommunications. The code 735 may be stored in a non-transitorycomputer-readable medium such as system memory or other type of memory.In some cases, the code 735 may not be directly executable by theprocessor 740 but may cause a computer (e.g., when compiled andexecuted) to perform functions described herein.

FIG. 8 shows a flowchart illustrating a method 800 that supportsresolving decodability for subsequent transmissions in accordance withaspects of the present disclosure. The operations of method 800 may beimplemented by a UE 115 or its components as described herein. Forexample, the operations of method 800 may be performed by acommunications manager as described with reference to FIGS. 4 through 7.In some examples, a UE may execute a set of instructions to control thefunctional elements of the UE to perform the functions described herein.Additionally or alternatively, a UE may perform aspects of the functionsdescribed herein using special-purpose hardware.

At 805, the UE may receive, from a base station, a transmissionincluding a TB. The operations of 805 may be performed according to themethods described herein. In some examples, aspects of the operations of805 may be performed by a TB receiver as described with reference toFIGS. 4 through 7.

At 810, the UE may attempt to decode the transmission. The operations of810 may be performed according to the methods described herein. In someexamples, aspects of the operations of 810 may be performed by a decoderas described with reference to FIGS. 4 through 7.

At 815, the UE may transmit a feedback message to the base stationindicating that at least a portion of the transmission including the TBwas unsuccessfully decoded. The operations of 815 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 815 may be performed by a feedback component asdescribed with reference to FIGS. 4 through 7.

At 820, the UE may receive, from the base station, one or moresubsequent transmissions of at least the TB. The operations of 820 maybe performed according to the methods described herein. In someexamples, aspects of the operations of 820 may be performed by asubsequent transmission receiver as described with reference to FIGS. 4through 7.

At 825, the UE may determine an effective UE throughput of the one ormore subsequent transmissions of at least the TB based on scaling aninitial UE throughput based on a function which is dependent at leastupon a duration of a PDSCH for the TB and a number of OFDM symbols ofthe one or more subsequent transmissions of at least the TB. Theoperations of 825 may be performed according to the methods describedherein. In some examples, aspects of the operations of 825 may beperformed by a subsequent transmission decoder as described withreference to FIGS. 4 through 7.

At 830, the UE may process a subsequent transmission of the one or moresubsequent transmissions based on whether the effective UE throughput ofthe one or more subsequent transmissions exceeds a predetermineddecoding throughput threshold. The operations of 830 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 830 may be performed by a subsequent transmissiondecoder as described with reference to FIGS. 4 through 7.

FIG. 9 shows a flowchart illustrating a method 900 that supportsresolving decodability for subsequent transmissions in accordance withaspects of the present disclosure. The operations of method 900 may beimplemented by a UE 115 or its components as described herein. Forexample, the operations of method 900 may be performed by acommunications manager as described with reference to FIGS. 4 through 7.In some examples, a UE may execute a set of instructions to control thefunctional elements of the UE to perform the functions described herein.Additionally or alternatively, a UE may perform aspects of the functionsdescribed herein using special-purpose hardware.

At 905, the UE may receive, from a base station, a transmissionincluding a TB. The operations of 905 may be performed according to themethods described herein. In some examples, aspects of the operations of905 may be performed by a TB receiver as described with reference toFIGS. 4 through 7.

At 910, the UE may attempt to decode the transmission. The operations of910 may be performed according to the methods described herein. In someexamples, aspects of the operations of 910 may be performed by a decoderas described with reference to FIGS. 4 through 7.

At 915, the UE may transmit a feedback message to the base stationindicating that at least a portion of the transmission including the TBwas unsuccessfully decoded. The operations of 915 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 915 may be performed by a feedback component asdescribed with reference to FIGS. 4 through 7.

At 920, the UE may receive, from the base station, one or moresubsequent transmissions of at least the TB. The operations of 920 maybe performed according to the methods described herein. In someexamples, aspects of the operations of 920 may be performed by asubsequent transmission receiver as described with reference to FIGS. 4through 7.

At 925, the UE may determine an effective UE throughput of the one ormore subsequent transmissions of at least the TB based on scaling aninitial UE throughput based on a function which is dependent at leastupon a duration of a PDSCH for the TB and a number of OFDM symbols ofthe one or more subsequent transmissions of at least the TB. Theoperations of 925 may be performed according to the methods describedherein. In some examples, aspects of the operations of 925 may beperformed by a subsequent transmission decoder as described withreference to FIGS. 4 through 7.

At 930, the UE may process a subsequent transmission of the one or moresubsequent transmissions based on whether the effective UE throughput ofthe one or more subsequent transmissions exceeds a predetermineddecoding throughput threshold. The operations of 930 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 930 may be performed by a subsequent transmissiondecoder as described with reference to FIGS. 4 through 7.

At 935, as an example when processing the subsequent transmission of theone or more subsequent transmissions, the UE may decode the subsequenttransmission based on the effective UE throughput of the one or moresubsequent transmissions being less than the predetermined decodingthroughput threshold. The operations of 935 may be performed accordingto the methods described herein. In some examples, aspects of theoperations of 935 may be performed by a subsequent transmission decoderas described with reference to FIGS. 4 through 7.

FIG. 10 shows a flowchart illustrating a method 1000 that supportsresolving decodability for subsequent transmissions whose throughputexceeds a threshold in accordance with aspects of the presentdisclosure. The operations of method 1000 may be implemented by a UE 115or its components as described herein. For example, the operations ofmethod 1000 may be performed by a communications manager as describedwith reference to FIGS. 4 through 7. In some examples, a UE may executea set of instructions to control the functional elements of the UE toperform the functions described herein. Additionally or alternatively, aUE may perform aspects of the functions described herein usingspecial-purpose hardware.

At 1005, the UE may receive, from a base station, a transmissionincluding a TB. The operations of 1005 may be performed according to themethods described herein. In some examples, aspects of the operations of1005 may be performed by a TB receiver as described with reference toFIGS. 4 through 7.

At 1010, the UE may attempt to decode the transmission. The operationsof 1010 may be performed according to the methods described herein. Insome examples, aspects of the operations of 1010 may be performed by adecoder as described with reference to FIGS. 4 through 7.

At 1015, the UE may transmit a feedback message to the base stationindicating that at least a portion of the transmission including the TBwas unsuccessfully decoded. The operations of 1015 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 1015 may be performed by a feedback component asdescribed with reference to FIGS. 4 through 7.

At 1020, the UE may receive, from the base station, one or moresubsequent transmissions of at least the TB. The operations of 1020 maybe performed according to the methods described herein. In someexamples, aspects of the operations of 1020 may be performed by asubsequent transmission receiver as described with reference to FIGS. 4through 7.

At 1025, the UE may determine an effective UE throughput of the one ormore subsequent transmissions of at least the TB based on scaling aninitial UE throughput based on a function which is dependent at leastupon a duration of a PDSCH for the TB and a number of OFDM symbols ofthe one or more subsequent transmissions of at least the TB. Theoperations of 1025 may be performed according to the methods describedherein. In some examples, aspects of the operations of 1025 may beperformed by a subsequent transmission decoder as described withreference to FIGS. 4 through 7.

At 1030, the UE may process a subsequent transmission of the one or moresubsequent transmissions based on whether the effective UE throughput ofthe one or more subsequent transmissions exceeds a predetermineddecoding throughput threshold. The operations of 1030 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 1030 may be performed by a subsequent transmissiondecoder as described with reference to FIGS. 4 through 7.

At 1035, as an example when processing the subsequent transmission ofthe one or more subsequent transmissions, the UE may refrain fromdecoding the subsequent transmission based on the effective UEthroughput of the one or more subsequent transmissions exceeding thepredetermined decoding throughput threshold. The operations of 1035 maybe performed according to the methods described herein. In someexamples, aspects of the operations of 1035 may be performed by asubsequent transmission decoder as described with reference to FIGS. 4through 7.

It should be noted that the methods described herein describe possibleimplementations, and that the operations and the steps may be rearrangedor otherwise modified and that other implementations are possible.Further, aspects from two or more of the methods may be combined.

Techniques described herein may be used for various wirelesscommunications systems such as code division multiple access (CDMA),time division multiple access (TDMA), frequency division multiple access(FDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and other systems.A CDMA system may implement a radio technology such as CDMA2000,Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000,IS-95, and IS-856 standards. IS-2000 Releases may be commonly referredto as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is commonly referred to asCDMA2000 1xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includesWideband CDMA (WCDMA) and other variants of CDMA. A TDMA system mayimplement a radio technology such as Global System for MobileCommunications (GSM).

An OFDMA system may implement a radio technology such as Ultra MobileBroadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical andElectronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal MobileTelecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are releasesof UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR,and GSM are described in documents from the organization named “3rdGeneration Partnership Project” (3GPP). CDMA2000 and UMB are describedin documents from an organization named “3rd Generation PartnershipProject 2” (3GPP2). The techniques described herein may be used for thesystems and radio technologies mentioned above as well as other systemsand radio technologies. While aspects of an LTE, LTE-A, LTE-A Pro, or NRsystem may be described for purposes of example, and LTE, LTE-A, LTE-APro, or NR terminology may be used in much of the description, thetechniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro,or NR applications.

A macro cell generally covers a relatively large geographic area (e.g.,several kilometers in radius) and may allow unrestricted access by UEs115 with service subscriptions with the network provider. A small cellmay be associated with a lower-powered base station 105, as comparedwith a macro cell, and a small cell may operate in the same or different(e.g., licensed, unlicensed, etc.) frequency bands as macro cells. Smallcells may include pico cells, femto cells, and micro cells according tovarious examples. A pico cell, for example, may cover a small geographicarea and may allow unrestricted access by UEs 115 with servicesubscriptions with the network provider. A femto cell may also cover asmall geographic area (e.g., a home) and may provide restricted accessby UEs 115 having an association with the femto cell (e.g., UEs 115 in aclosed subscriber group (CSG), UEs 115 for users in the home, and thelike). An eNB for a macro cell may be referred to as a macro eNB. An eNBfor a small cell may be referred to as a small cell eNB, a pico eNB, afemto eNB, or a home eNB. An eNB may support one or multiple (e.g., two,three, four, and the like) cells, and may also support communicationsusing one or multiple component carriers.

The wireless communications system 100 or systems described herein maysupport synchronous or asynchronous operation. For synchronousoperation, the base stations 105 may have similar frame timing, andtransmissions from different base stations 105 may be approximatelyaligned in time. For asynchronous operation, the base stations 105 mayhave different frame timing, and transmissions from different basestations 105 may not be aligned in time. The techniques described hereinmay be used for either synchronous or asynchronous operations.

Information and signals described herein may be represented using any ofa variety of different technologies and techniques. For example, data,instructions, commands, information, signals, bits, symbols, and chipsthat may be referenced throughout the above description may berepresented by voltages, currents, electromagnetic waves, magneticfields or particles, optical fields or particles, or any combinationthereof.

The various illustrative blocks and modules described in connection withthe disclosure herein may be implemented or performed with ageneral-purpose processor, a DSP, an ASIC, an FPGA or other PLD,discrete gate or transistor logic, discrete hardware components, or anycombination thereof designed to perform the functions described herein.A general-purpose processor may be a microprocessor, but in thealternative, the processor may be any conventional processor,controller, microcontroller, or state machine. A processor may also beimplemented as a combination of computing devices (e.g., a combinationof a DSP and a microprocessor, multiple microprocessors, one or moremicroprocessors in conjunction with a DSP core, or any other suchconfiguration).

The functions described herein may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions may bestored on or transmitted over as one or more instructions or code on acomputer-readable medium. Other examples and implementations are withinthe scope of the disclosure and appended claims. For example, due to thenature of software, functions described herein can be implemented usingsoftware executed by a processor, hardware, firmware, hardwiring, orcombinations of any of these. Features implementing functions may alsobe physically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations.

Computer-readable media includes both non-transitory computer storagemedia and communication media including any medium that facilitatestransfer of a computer program from one place to another. Anon-transitory storage medium may be any available medium that can beaccessed by a general purpose or special purpose computer. By way ofexample, and not limitation, non-transitory computer-readable media mayinclude RAM, ROM, electrically erasable programmable read only memory(EEPROM), flash memory, compact disk (CD) ROM or other optical diskstorage, magnetic disk storage or other magnetic storage devices, or anyother non-transitory medium that can be used to carry or store desiredprogram code means in the form of instructions or data structures andthat can be accessed by a general-purpose or special-purpose computer,or a general-purpose or special-purpose processor. Also, any connectionis properly termed a computer-readable medium. For example, if thesoftware is transmitted from a website, server, or other remote sourceusing a coaxial cable, fiber optic cable, twisted pair, digitalsubscriber line (DSL), or wireless technologies such as infrared, radio,and microwave, then the coaxial cable, fiber optic cable, twisted pair,DSL, or wireless technologies such as infrared, radio, and microwave areincluded in the definition of medium. Disk and disc, as used herein,include CD, laser disc, optical disc, digital versatile disc (DVD),floppy disk and Blu-ray disc where disks usually reproduce datamagnetically, while discs reproduce data optically with lasers.Combinations of the above are also included within the scope ofcomputer-readable media.

As used herein, including in the claims, “or” as used in a list of items(e.g., a list of items prefaced by a phrase such as “at least one of” or“one or more of”) indicates an inclusive list such that, for example, alist of at least one of A, B, or C means A or B or C or AB or AC or BCor ABC (i.e., A and B and C). Also, as used herein, the phrase “basedon” shall not be construed as a reference to a closed set of conditions.For example, an exemplary step that is described as “based on conditionA” may be based on both a condition A and a condition B withoutdeparting from the scope of the present disclosure. In other words, asused herein, the phrase “based on” shall be construed in the same manneras the phrase “based at least in part on.”

In the appended figures, similar components or features may have thesame reference label. Further, various components of the same type maybe distinguished by following the reference label by a dash and a secondlabel that distinguishes among the similar components. If just the firstreference label is used in the specification, the description isapplicable to any one of the similar components having the same firstreference label irrespective of the second reference label, or othersubsequent reference label.

The description set forth herein, in connection with the appendeddrawings, describes example configurations and does not represent allthe examples that may be implemented or that are within the scope of theclaims. The term “exemplary” used herein means “serving as an example,instance, or illustration,” and not “preferred” or “advantageous overother examples.” The detailed description includes specific details forthe purpose of providing an understanding of the described techniques.These techniques, however, may be practiced without these specificdetails. In some instances, well-known structures and devices are shownin block diagram form in order to avoid obscuring the concepts of thedescribed examples.

The description herein is provided to enable a person skilled in the artto make or use the disclosure. Various modifications to the disclosurewill be readily apparent to those skilled in the art, and the genericprinciples defined herein may be applied to other variations withoutdeparting from the scope of the disclosure. Thus, the disclosure is notlimited to the examples and designs described herein but is to beaccorded the broadest scope consistent with the principles and novelfeatures disclosed herein.

The following provides an overview of further examples of the presentinvention:

Example 1: A method for wireless communication at a UE, comprising:receiving, from a base station, a transmission including a TB;attempting to decode the transmission; transmitting a feedback messageto the base station indicating that at least a portion of thetransmission including the TB was unsuccessfully decoded; receiving,from the base station, one or more subsequent transmissions of at leastthe TB; determining an effective UE throughput of the one or moresubsequent transmissions of at least the TB based at least in part onscaling an initial UE throughput based on a function which is dependentat least upon a duration of a physical downlink shared channel for theTB and a number of orthogonal frequency division multiplexing (OFDM)symbols of the one or more subsequent transmissions of at least the TB;and processing a subsequent transmission of the one or more subsequenttransmissions based at least in part on whether the effective UEthroughput of the one or more subsequent transmissions exceeds apredetermined decoding throughput threshold.

Example 2: The method of example 1, wherein processing the subsequenttransmission of the one or more subsequent transmissions comprises:decoding the subsequent transmission based on the effective UEthroughput of the one or more subsequent transmissions being less thanthe predetermined decoding throughput threshold.

Example 3: The method of example 1, wherein processing the subsequenttransmission of the one or more subsequent transmissions comprises:refraining from decoding the subsequent transmission based on theeffective UE throughput of the one or more subsequent transmissionsexceeding the predetermined decoding throughput threshold.

Example 3a: The method of example 1, wherein processing the subsequenttransmission of the one or more subsequent transmissions comprises:refraining from decoding any of the one or more subsequent transmissionsbased on the effective UE throughput of the one or more subsequenttransmissions exceeding the predetermined decoding throughput threshold.

Example 3b: The method of example 1, wherein processing the subsequenttransmission of the one or more subsequent transmissions comprises:refraining from decoding the TB of the one or more subsequenttransmissions based on the effective UE throughput of the one or moresubsequent transmissions exceeding the predetermined decoding throughputthreshold.

Example 4: The method of any of examples 1 to 3b, wherein the effectiveUE throughput of the subsequent transmission is evaluated for aninterval ending at an end of a last symbol of a latest PDSCHtransmission.

Example 5: The method of any of examples 1 to 4, wherein thepredetermined decoding throughput threshold (TP_(max)) is defined as:

${{TP}_{\max} = {\frac{1}{R_{LBRM}}\; {TBS}_{LBRM}}},$

where TBS_(LBRM) is a maximum TB size with limited buffer rate matching(LBRM) enabled, and where R_(LBRM) is a coding rate when transmitting aTB of the maximum TB size with LBRM enabled.

Example 6: The method of example 5, wherein the effective UE throughputof the subsequent transmission is defined as:

${2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum\limits_{i \in S}\; {{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot x_{i}}F_{i}}}},$

where μ relates to a sub-carrier spacing (SCS) for the one or moresubsequent transmissions for an active bandwidth part, μ′ corresponds toan SCS of a bandwidth part across all configured bandwidth parts of acarrier that has a largest configured number of physical resourceblocks, C′_(i) is a number of scheduled codeblocks for an i^(th) TB,L_(i) is a physical downlink shared channel (PDSCH) duration for thei^(th) TB, S is a set of TBs scheduled partially or fully in aconsecutive-symbol duration for the i^(th) TB, x_(i) is a number oforthogonal frequency division multiplexing (OFDM) symbols of the one ormore subsequent transmissions of the i^(th) TB, F_(i) is a number ofcoded bits in a codeblock and is a maximum value of a min(k_(0,i)^(j)+E_(i) ^(j), N_(cb,i)), where k_(0,i) ^(j) is a starting location ofa redundancy value for a j^(th) transmission, E_(i) ^(k) is a min(E_(r))of scheduled code blocks for the j^(th) transmission, N_(cb,i) is acircular buffer length, where j ranges from 0 to J−1, where J−1 is acurrent subsequent transmission for the ^(jth) TB,

$\left\lfloor \frac{C_{i^{\prime}}}{L_{i}} \right\rfloor$

is a floor function for the input

$\frac{C_{i^{\prime}}}{L_{i}},{{and}\mspace{14mu} {2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum\limits_{i\; \epsilon \; S}\; {\left\lfloor \frac{C_{i^{\prime}}}{L_{i}} \right\rfloor \cdot F_{i}}}}}$

of represents the initial UE throughput.

Example 7: The method of any of examples 1 to 6, wherein the subsequenttransmission of the one or more subsequent transmissions is alast-received subsequent transmission.

Example 8: The method of any of examples 1 to 7, wherein thepredetermined decoding throughput threshold is based at least in part ona throughput for decoding a TB of a maximum TB size transmitted in afourteen-symbol duration.

Example 9: The method of any of examples 1 to 7, wherein thepredetermined decoding throughput threshold is based at least in part ona maximum TB size, a number of codeblocks for transmitting a TB of themaximum TB size, a length of a codeblock-level CRC, a length of atransport-level CRC, a coding rate for transmitting a TB of the maximumTB size with LBRM enabled, and a scaling factor.

Example 10: The method of example 9, wherein the scaling factor is one.

Example 11: The method of example 9, wherein the scaling factor isgreater than one.

Example 12: The method of any of examples 1 to 11, wherein the effectiveUE throughput of the one or more subsequent transmissions is based atleast in part on a number of transmitted codeblocks in the TB, acircular buffer size, and a physical downlink shared channel (PDSCH)duration for the one or more subsequent transmissions.

Example 13: The method of example 12, wherein the effective UEthroughput of the subsequent transmission is applicable for a subsequenttransmission whose PDSCH duration is greater than a mini-slot durationbut is not applicable for subsequent transmissions involving differentsub-carrier spacing values or back-to-back subsequent transmissionswhose PDSCH durations are of a mini-slot.

Example 14: The method of example 12, wherein the effective UEthroughput of the one or more subsequent transmissions is further basedon a sub-carrier spacing of the subsequent transmission and a minimumsub-carrier spacing of a component carrier carrying the one or moresubsequent transmissions.

Example 15: The method of example 14, wherein the effective UEthroughput of the subsequent transmission is applicable for a subsequenttransmission whose PDSCH duration is greater than a mini-slot durationand is applicable for a subsequent transmission involving differentsub-carrier spacing values than the transmission including the TB.

Example 16: The method of example 14, wherein the effective UEthroughput of the one or more subsequent transmissions is further basedon a sum of UE throughputs for multiple TBs in the one or moresubsequent transmissions.

Example 17: The method of example 16, wherein the effective UEthroughput of the one or more subsequent transmissions is applicable forsubsequent transmissions that are not using redundancy version zero, theredundancy version zero indicating the subsequent transmissions begin ata bit zero of an encoded information message.

Example 18: The method of example 16, wherein the effective UEthroughput of the one or more subsequent transmissions is applicableregardless of a redundancy version used by the one or more subsequenttransmissions, the redundancy version indicating a location in anencoded information message where the one or more subsequenttransmissions begin.

Example 19: The method of any of examples 1 to 18, wherein processingthe subsequent transmission of the one or more subsequent transmissionscomprises determining whether to require the UE to decode at least oneor more of the one or more subsequent transmissions.

Example 20: The method of any of example 19, wherein determining whetherto require the UE to decode the subsequent transmission of the one ormore subsequent transmissions is based at least in part on whether aneffective UE throughput of the at least one or more of the one or moresubsequent transmissions exceeds the predetermined decoding throughputthreshold.

Example 21: An apparatus comprising at least one means for performing amethod of any of examples 1 to 20.

Example 22: An apparatus for wireless communications comprising aprocessor; memory in electronic communication with the processor; andinstructions stored in the memory and executable by the processor tocause the apparatus to perform a method of any of examples 1 to 20.

Example 23: A non-transitory computer-readable medium storing code forwireless communications, the code comprising instructions executable bya processor to perform a method of any of examples 1 to 20.

What is claimed is:
 1. A method for wireless communication at a userequipment (UE), comprising: receiving, from a base station, atransmission including a transport block (TB); attempting to decode thetransmission; transmitting a feedback message to the base stationindicating that at least a portion of the transmission including the TBwas unsuccessfully decoded; receiving, from the base station, one ormore subsequent transmissions of at least the TB; determining aneffective UE throughput of the one or more subsequent transmissions ofat least the TB based at least in part on scaling an initial UEthroughput based on a function which is dependent at least upon aduration of a physical downlink shared channel for the TB and a numberof orthogonal frequency division multiplexing (OFDM) symbols of the oneor more subsequent transmissions of at least the TB; and processing asubsequent transmission of the one or more subsequent transmissionsbased at least in part on whether the effective UE throughput of the oneor more subsequent transmissions exceeds a predetermined decodingthroughput threshold.
 2. The method of claim 1, wherein processing thesubsequent transmission of the one or more subsequent transmissionscomprises: decoding the subsequent transmission based on the effectiveUE throughput of the one or more subsequent transmissions being lessthan the predetermined decoding throughput threshold.
 3. The method ofclaim 1, wherein processing the subsequent transmission of the one ormore subsequent transmissions comprises: refraining from decoding thesubsequent transmission based on the effective UE throughput of the oneor more subsequent transmissions exceeding the predetermined decodingthroughput threshold.
 4. The method of claim 1, wherein processing thesubsequent transmission of the one or more subsequent transmissionscomprises: refraining from decoding any of the one or more subsequenttransmissions based on the effective UE throughput of the one or moresubsequent transmissions exceeding the predetermined decoding throughputthreshold.
 5. The method of claim 1, wherein processing the subsequenttransmission of the one or more subsequent transmissions comprises:refraining from decoding the TB of the one or more subsequenttransmissions based on the effective UE throughput of the one or moresubsequent transmissions exceeding the predetermined decoding throughputthreshold.
 6. The method of claim 1, wherein the effective UE throughputof the subsequent transmission is evaluated for an interval ending at anend of a last symbol of a latest PDSCH transmission.
 7. The method ofclaim 1, wherein the predetermined decoding throughput threshold(TP_(max)) is defined as:${{TP}_{\max} = {\frac{1}{R_{LBRM}}\; {TBS}_{LBRM}}},$ whereTBS_(LBRM) is a maximum TB size with limited buffer rate matching (LBRM)enabled, and where R_(LBRM) is a coding rate when transmitting a TB ofthe maximum TB size with LBRM enabled.
 8. The method of claim 7, whereinthe effective UE throughput of the subsequent transmission is definedas:$2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum\limits_{i \in S}\; {{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot x_{i}}F_{i}}}$where μ relates to a sub-carrier spacing (SCS) for the one or moresubsequent transmissions for an active bandwidth part, μ′ corresponds toan SCS of a bandwidth part across all configured bandwidth parts of acarrier that has a largest configured number of physical resourceblocks, C′_(i) is a number of scheduled codeblocks for an i^(th) TB,L_(i) is a physical downlink shared channel (PDSCH) duration for thei^(th) TB, S is a set of TBs scheduled partially or fully in aconsecutive-symbol duration for the i^(th) TB, x_(i) is a number oforthogonal frequency division multiplexing (OFDM) symbols of the one ormore subsequent transmissions of the i^(th) TB, F_(i) is a number ofcoded bits in a codeblock and is a maximum value of a min(k_(0,i)^(j)+E_(i) ^(j), N_(cb,i)), where k_(0,i) ^(j) is a starting location ofa redundancy value for a j^(th) transmission, E_(i) ^(j) is a min(E_(r))of scheduled code blocks for the j^(th) transmission, N_(cb,i) is acircular buffer length, where j ranges from 0 to J−1, which is a currentsubsequent transmission for the i^(th) TB,$\left\lfloor \frac{C_{i^{\prime}}}{L_{i}} \right\rfloor$ is a floorfunction for the input of$\frac{C_{i^{\prime}}}{L_{i}},{{and}\mspace{14mu} {2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum\limits_{i\; \epsilon \; S}\; {\left\lfloor \frac{C_{i^{\prime}}}{L_{i}} \right\rfloor \cdot F_{i}}}}}$represents the initial UE throughput.
 9. The method of claim 1, whereinthe subsequent transmission of the one or more subsequent transmissionsis a last-received subsequent transmission.
 10. The method of claim 1,wherein the predetermined decoding throughput threshold is based atleast in part on a throughput for decoding a TB of a maximum TB sizetransmitted in a fourteen-symbol duration.
 11. The method of claim 1,wherein the predetermined decoding throughput threshold is based atleast in part on a maximum TB size, a number of codeblocks fortransmitting a TB of the maximum TB size, a length of a codeblock-levelcyclic redundancy check (CRC), a length of a transport-level CRC, acoding rate for transmitting a TB of the maximum TB size withlimited-buffer rate-matching (LBRM) enabled, and a scaling factor. 12.The method of claim 11, wherein the scaling factor is one.
 13. Themethod of claim 11, wherein the scaling factor is greater than one. 14.The method of claim 1, wherein the effective UE throughput of the one ormore subsequent transmissions is based at least in part on a number oftransmitted codeblocks in the TB, a circular buffer size, and a physicaldownlink shared channel (PDSCH) duration for the one or more subsequenttransmissions.
 15. The method of claim 14, wherein the effective UEthroughput of the subsequent transmission is applicable for a subsequenttransmission whose PDSCH duration is greater than a mini-slot durationbut is not applicable for subsequent transmissions involving differentsub-carrier spacing values or back-to-back subsequent transmissionswhose PDSCH durations are of a mini-slot.
 16. The method of claim 14,wherein the effective UE throughput of the one or more subsequenttransmissions is further based on a sub-carrier spacing of thesubsequent transmission and a minimum sub-carrier spacing of a componentcarrier carrying the one or more subsequent transmissions.
 17. Themethod of claim 16, wherein the effective UE throughput of thesubsequent transmission is applicable for a subsequent transmissionwhose PDSCH duration is greater than a mini-slot duration and isapplicable for a subsequent transmission involving different sub-carrierspacing values than the transmission including the TB.
 18. The method ofclaim 16, wherein the effective UE throughput of the one or moresubsequent transmissions is further based on a sum of UE throughputs formultiple TBs in the one or more subsequent transmissions.
 19. The methodof claim 18, wherein the effective UE throughput of the one or moresubsequent transmissions is applicable for subsequent transmissions thatare not using a redundancy version zero, the redundancy version zeroindicating the subsequent transmissions begin at a bit zero of anencoded information message.
 20. The method of claim 18, wherein theeffective UE throughput of the one or more subsequent transmissions isapplicable regardless of a redundancy version used by the one or moresubsequent transmissions, the redundancy version indicating a locationin an encoded information message where the one or more subsequenttransmissions begin.
 21. The method of claim 1, wherein processing thesubsequent transmission of the one or more subsequent transmissionscomprises: determining whether the UE is required to decode thesubsequent transmission of the one or more subsequent transmissions. 22.The method of claim 21, wherein determining whether the UE is requiredto decode the subsequent transmission of the one or more subsequenttransmissions is based at least in part on whether the effective UEthroughput of at least the one or more subsequent transmissions exceedsthe predetermined decoding throughput threshold.
 23. An apparatus forwireless communication at a user equipment (UE), comprising: aprocessor, memory coupled with the processor; and instructions stored inthe memory and executable by the processor to cause the apparatus to:receive, from a base station, a transmission including a transport block(TB); attempt to decode the transmission; transmit a feedback message tothe base station indicating that at least a portion of the transmissionincluding the TB was unsuccessfully decoded; receive, from the basestation, one or more subsequent transmissions of at least the TB;determine an effective UE throughput of the one or more subsequenttransmissions of at least the TB based at least in part on scaling aninitial UE throughput based on a function which is dependent at leastupon a duration of a physical downlink shared channel for the TB and anumber of orthogonal frequency division multiplexing (OFDM) symbols ofthe one or more subsequent transmissions of at least the TB; and processa subsequent transmission of the one or more subsequent transmissionsbased at least in part on whether the effective UE throughput of the oneor more subsequent transmissions exceeds a predetermined decodingthroughput threshold.
 24. The apparatus of claim 23, wherein theinstructions to process the subsequent transmission of the one or moresubsequent transmissions are further executable by the processor tocause the apparatus to: decode the subsequent transmission based on theeffective UE throughput of the one or more subsequent transmissionsbeing less than the predetermined decoding throughput threshold.
 25. Theapparatus of claim 23, wherein the instructions to process thesubsequent transmission of the one or more subsequent transmissions arefurther executable by the processor to cause the apparatus to: refrainfrom decoding any of the one or more subsequent transmissions based onthe effective UE throughput of the one or more subsequent transmissionsexceeding the predetermined decoding throughput threshold.
 26. Theapparatus of claim 23, wherein the effective UE throughput of thesubsequent transmission is evaluated for an interval ending at an end ofa last symbol of a latest PDSCH transmission.
 27. The apparatus of claim23, wherein the predetermined decoding throughput threshold (TP_(max))is defined as: ${{TP}_{\max} = {\frac{1}{R_{LBRM}}\; {TBS}_{LBRM}}},$where TBS_(LBRM) is a maximum TB size with limited buffer rate matching(LBRM) enabled, and where R_(LBRM) is a coding rate when transmitting aTB of the maximum TB size with LBRM enabled.
 28. The apparatus of claim27, wherein the effective UE throughput of the subsequent transmissionis defined as:$2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum\limits_{i \in S}\; {{\left\lfloor \frac{C_{i}^{\prime}}{L_{i}} \right\rfloor \cdot x_{i}}F_{i}}}$where μ relates to a sub-carrier spacing (SCS) for the one or moresubsequent transmissions for an active bandwidth part, μ′ corresponds toan SCS of a bandwidth part across all configured bandwidth parts of acarrier that has a largest configured number of physical resourceblocks, C′_(i) is a number of scheduled codeblocks for an i^(th) TB,L_(i) is a physical downlink shared channel (PDSCH) duration for thei^(th) TB, S is a set of TBs scheduled partially or fully in aconsecutive-symbol duration for the i^(th) TB, x_(i) is a number oforthogonal frequency division multiplexing (OFDM) symbols of the one ormore subsequent transmissions of the i^(th) TB, F_(i) is a number ofcoded bits in a codeblock and is a maximum value of a min(k_(0,i)^(j)+E_(i) ^(j), N_(cb,i)), where k_(0,i) ^(j) is a starting location ofa redundancy value for a j^(th) transmission, E_(i) ^(j) is a min(E_(r))of scheduled code blocks for the j^(th) transmission, N_(cb,i) is acircular buffer length, where j ranges from 0 to J−1, which is a currentsubsequent transmission for the i^(th) TB,$\left\lfloor \frac{C_{i^{\prime}}}{L_{i}} \right\rfloor$ is a floorfunction for the input of$\frac{C_{i^{\prime}}}{L_{i}},{{and}\mspace{14mu} {2^{\max {({0,{\mu - \mu^{\prime}}})}} \cdot {\sum\limits_{i\; \epsilon \; S}\; {\left\lfloor \frac{C_{i^{\prime}}}{L_{i}} \right\rfloor \cdot F_{i}}}}}$represents the initial UE throughput.
 29. An apparatus for wirelesscommunication at a user equipment (UE), comprising: means for receiving,from a base station, a transmission including a transport block (TB);means for attempting to decode the transmission; means for transmittinga feedback message to the base station indicating that at least aportion of the transmission including the TB was unsuccessfully decoded;means for receiving, from the base station, one or more subsequenttransmissions of at least the TB; means for determining an effective UEthroughput of the one or more subsequent transmissions of at least theTB based at least in part on scaling an initial UE throughput based on afunction which is dependent at least upon a duration of a physicaldownlink shared channel for the TB and a number of orthogonal frequencydivision multiplexing (OFDM) symbols of the one or more subsequenttransmissions of at least the TB; and means for processing a subsequenttransmission of the one or more subsequent transmissions based at leastin part on whether the effective UE throughput of the one or moresubsequent transmissions exceeds a predetermined decoding throughputthreshold.
 30. A non-transitory computer-readable medium storing codefor wireless communication at a user equipment (UE), the code comprisinginstructions executable by a processor to: receive, from a base station,a transmission including a transport block (TB); attempt to decode thetransmission; transmit a feedback message to the base station indicatingthat at least a portion of the transmission including the TB wasunsuccessfully decoded; receive, from the base station, one or moresubsequent transmissions of at least the TB; determine an effective UEthroughput of the one or more subsequent transmissions of at least theTB based at least in part on scaling an initial UE throughput based on afunction which is dependent at least upon a duration of a physicaldownlink shared channel for the TB and a number of orthogonal frequencydivision multiplexing (OFDM) symbols of the one or more subsequenttransmissions of at least the TB; and process a subsequent transmissionof the one or more subsequent transmissions based at least in part onwhether the effective UE throughput of the one or more subsequenttransmissions exceeds a predetermined decoding throughput threshold.